Line data Source code
1 : #include "Flame.H"
2 : #include "IO/ParmParse.H"
3 : #include "BC/Constant.H"
4 : #include "Numeric/Stencil.H"
5 : #include "IC/Laminate.H"
6 : #include "IC/Constant.H"
7 : #include "IC/PSRead.H"
8 : #include "Numeric/Function.H"
9 : #include "IC/Expression.H"
10 : #include "IC/BMP.H"
11 : #include "IC/PNG.H"
12 : #include "Base/Mechanics.H"
13 : #include "Util/Util.H"
14 : #include "Model/Propellant/Propellant.H"
15 : #include "Model/Propellant/FullFeedback.H"
16 : #include "Model/Propellant/Homogenize.H"
17 : #include <cmath>
18 :
19 : namespace Integrator
20 : {
21 :
22 3 : Flame::Flame() :
23 3 : Base::Mechanics<model_type>() {}
24 :
25 3 : Flame::Flame(IO::ParmParse& pp) : Flame()
26 : {
27 3 : pp_queryclass(*this);
28 3 : }
29 :
30 :
31 : void
32 3 : Flame::Forbids(IO::ParmParse& pp)
33 : {
34 12 : pp.forbid("pressure.P","use chamber.pressure instead");
35 :
36 12 : pp.forbid("geometry.x_len","This is specified by geometry.prob_lo/hi");
37 12 : pp.forbid("geometry.y_len","This is specified by geometry.prob_lo/hi");
38 12 : pp.forbid("amr.ghost_cells", "This should not be adjustable ");
39 :
40 12 : pp.forbid("pf.gamma","use propellant.powerlaw.gamma");
41 :
42 12 : pp.forbid("pressure.r_ap", "use propellant.powerlaw.r_ap");
43 12 : pp.forbid("pressure.r_htpb", "use propellant.powerlaw.r_htpb");
44 12 : pp.forbid("pressure.r_comb", "use propellant.powerlaw.r_comb");
45 12 : pp.forbid("pressure.n_ap", "use propellant.powerlaw.n_ap");
46 12 : pp.forbid("pressure.n_htpb", "use propellant.powerlaw.n_htpb");
47 12 : pp.forbid("pressure.n_comb", "use propellant.powerlaw.n_comb");
48 :
49 12 : pp.forbid("thermal.bound", "use thermal.Tref");
50 12 : pp.forbid("thermal.T_fluid", "use thermal.Tfluid (or nothing)");
51 12 : pp.forbid("thermal.m_ap", "use propellant.fullfeedback.m_ap");
52 12 : pp.forbid("thermal.m_htpb", "use propellant.fullfeedback.m_htpb");
53 12 : pp.forbid("thermal.E_ap", "use propellant.fullfeedback.E_ap");
54 12 : pp.forbid("thermal.E_htpb", "use propellant.fullfeedback.E_htpb");
55 12 : pp.forbid("thermal.modeling_ap", "Old debug variable. Should equal 1 ");
56 12 : pp.forbid("thermal.modeling_htpb", "Old debug variable. Should equal 1");
57 :
58 12 : pp.forbid("pressure.a1", "use propellant.fullfeedback.a1 instead");
59 12 : pp.forbid("pressure.a2", "use propellant.fullfeedback.a2 instead");
60 12 : pp.forbid("pressure.a3", "use propellant.fullfeedback.a3 instead");
61 12 : pp.forbid("pressure.b1", "use propellant.fullfeedback.b1 instead");
62 12 : pp.forbid("pressure.b2", "use propellant.fullfeedback.b2 instead");
63 12 : pp.forbid("pressure.b3", "use propellant.fullfeedback.b3 instead");
64 12 : pp.forbid("pressure.c1", "use propellant.fullfeedback.c1 instead");
65 12 : pp.forbid("pressure.mob_ap", "no longer used");
66 12 : pp.forbid("pressure.dependency", "use propellant.fullfeedback.pressure_dependency");
67 12 : pp.forbid("pressure.h1", "use propellant.homogenize.h1 instead");
68 12 : pp.forbid("pressure.h2", "use propellant.homogenize.h2 instead");
69 12 : pp.forbid("thermal.mlocal_ap", "use propellant.homogenize.mlocal_ap");
70 12 : pp.forbid("thermal.mlocal_comb", "use propellant.homogenize.mlocal_comb");
71 12 : pp.forbid("thermal.mlocal_htpb", "this actually did **nothing** - it was overridden by a hard code using massfraction.");
72 :
73 12 : pp.forbid("thermal.disperssion1", "use propellant.homogenize.dispersion1");
74 12 : pp.forbid("thermal.disperssion2", "use propellant.homogenize.dispersion2");
75 12 : pp.forbid("thermal.disperssion3", "use propellant.homogenize.dispersion3");
76 :
77 12 : pp.forbid("thermal.rho_ap", "use propellant.fullfeedback/homogenize.rho_ap ");
78 12 : pp.forbid("thermal.rho_htpb","use propellant.fullfeedback/homogenize.rho_htpb ");
79 12 : pp.forbid("thermal.k_ap", "use propellant.fullfeedback/homogenize.k_ap ");
80 12 : pp.forbid("thermal.k_htpb", "use propellant.fullfeedback/homogenize.k_htpb ");
81 12 : pp.forbid("thermal.cp_ap", "use propellant.fullfeedback/homogenize.cp_ap ");
82 9 : pp.forbid("thermal.cp_htpb","use propellant.fullfeedback/homogenize.cp_htpb ");
83 3 : }
84 :
85 :
86 : // [parser]
87 : void
88 3 : Flame::Parse(Flame& value, IO::ParmParse& pp)
89 : {
90 : BL_PROFILE("Integrator::Flame::Flame()");
91 :
92 3 : Forbids(pp);
93 :
94 : // Whether to include extra fields (such as mdot, etc) in the plot output
95 6 : pp.query_default("plot_field",value.plot_field,true);
96 :
97 : //
98 : // PHASE FIELD VARIABLES
99 : //
100 :
101 : // Burn width thickness
102 12 : pp.query_default("pf.eps", value.pf.eps, "1.0_m", Unit::Length());
103 : // Interface energy param
104 12 : pp.query_default("pf.kappa", value.pf.kappa, "0.0_J/m^2", Unit::Energy() / Unit::Area());
105 : // Chemical potential multiplier
106 12 : pp.query_default("pf.lambda", value.pf.lambda, "0.0_J/m^2", Unit::Energy()/Unit::Area());
107 : // Unburned rest energy
108 12 : pp.query_default("pf.w1", value.pf.w1, "0.0",Unit::Less());
109 : // Barrier energy
110 12 : pp.query_default("pf.w12", value.pf.w12, "0.0", Unit::Less());
111 : // Burned rest energy
112 12 : pp.query_default("pf.w0", value.pf.w0, "0.0",Unit::Less());
113 :
114 : // Boundary conditions for phase field order params
115 6 : pp.select<BC::Constant>("pf.eta.bc", value.bc_eta, 1 );
116 9 : value.RegisterNewFab(value.eta_mf, value.bc_eta, 1, 2, "eta", true);
117 9 : value.RegisterNewFab(value.eta_old_mf, value.bc_eta, 1, 2, "eta_old", 0);
118 :
119 : // Inital value of eta that doesn't evolve and is used during refiment to set the updated values of eta with voids in the domain.
120 : // Used to fix a bug where duirn refinement, a void won't be updated correctly and would be a square, not a circle
121 9 : value.RegisterNewFab(value.eta_0_mf, value.bc_eta, 1, 2, "eta_0", 0);
122 :
123 : // value.RegisterNewFab(value.eta_mf_frozen, value.bc_eta, 1, 2, "eta_frozen", value.plot_field);
124 :
125 : // phase field initial condition
126 6 : pp.select<IC::Laminate,IC::Constant,IC::Expression,IC::BMP,IC::PNG, IC::PSRead>("pf.eta.ic",value.ic_eta,value.geom);
127 :
128 :
129 : // Select reduced order model to capture heat feedback
130 : pp.select< Model::Propellant::PowerLaw,
131 : Model::Propellant::FullFeedback,
132 : Model::Propellant::Homogenize>
133 6 : ("propellant",value.propellant);
134 :
135 :
136 : // Whether to use the Thermal Transport Model
137 6 : pp_query_default("thermal.on", value.thermal.on, false);
138 :
139 : // Reference temperature
140 : // Used to set all other reference temperatures by default.
141 12 : pp_query_default("thermal.Tref", value.thermal.Tref, "300.0_K",Unit::Temperature());
142 :
143 3 : if (value.thermal.on) {
144 :
145 : // Used to change heat flux units
146 4 : pp_query_default("thermal.hc", value.thermal.hc, "1.0", Unit::Power()/Unit::Area());
147 :
148 : // Effective fluid temperature, temp of the eta = 0 (fluid) region
149 2 : pp_query_default("thermal.Tfluid", value.thermal.Tfluid, value.thermal.Tref);
150 :
151 : // Cutoff value for regression, if T < Tcutoff eta won't evolve/regress
152 4 : pp.query_default("thermal.Tcutoff", value.thermal.Tcutoff, "0.0", Unit::Temperature());
153 :
154 : // Switch time of the improved regridding where eta and the temperature field are both used. It is recommended to make this time ~10x the timestep
155 : // Before this the refinement is based on the gradient of eta which helps the laser IC start correctly. A regrid is forced when this time is reached.
156 4 : pp.query_default("thermal.end_initial_refine_time", value.thermal.end_initial_refine_time, "0.0", Unit::Time());
157 :
158 : //Temperature boundary condition
159 2 : pp.select_default<BC::Constant>("thermal.temp.bc", value.bc_temp, 1, Unit::Temperature());
160 :
161 3 : value.RegisterNewFab(value.temp_mf, value.bc_temp, 1, 3, "temp", true);
162 3 : value.RegisterNewFab(value.temp_old_mf, value.bc_temp, 1, 3, "temp_old", false);
163 3 : value.RegisterNewFab(value.temps_mf, value.bc_temp, 1, 0, "temps", false);
164 :
165 3 : value.RegisterNewFab(value.mdot_mf, value.bc_temp, 1, 0, "mdot", value.plot_field);
166 3 : value.RegisterNewFab(value.alpha_mf, value.bc_temp, 1, 0, "alpha", value.plot_field);
167 3 : value.RegisterNewFab(value.heatflux_mf, value.bc_temp, 1, 0, "heatflux", value.plot_field);
168 3 : value.RegisterNewFab(value.laser_mf, value.bc_temp, 1, 0, "laser", value.plot_field);
169 :
170 2 : value.RegisterIntegratedVariable(&value.chamber.volume, "volume");
171 2 : value.RegisterIntegratedVariable(&value.chamber.area, "area");
172 2 : value.RegisterIntegratedVariable(&value.chamber.massflux, "mass_flux");
173 :
174 3 : value.RegisterNewFab(value.thermal.has_exceeded_Tcutoff, value.bc_temp, 1, 2, "exceeded_Tcutoff", 0); // Used to determine where regression has started
175 :
176 : // laser initial condition
177 : pp.select_default< IC::Constant,
178 : IC::Expression >
179 2 : ("laser.ic",value.ic_laser, value.geom, Unit::Power()/Unit::Area());
180 :
181 : // thermal initial condition
182 : pp.select_default< IC::Constant,
183 : IC::Expression,
184 : IC::BMP,
185 : IC::PNG >
186 3 : ("temp.ic",value.thermal.ic_temp,value.geom, Unit::Temperature());
187 : }
188 :
189 :
190 : // Constant pressure value
191 12 : pp_query_default("chamber.pressure", value.chamber.pressure, "1.0_MPa", Unit::Pressure());
192 :
193 : // Whether to compute the pressure evolution
194 6 : pp_query_default("variable_pressure", value.variable_pressure, false);
195 :
196 : // Refinement criterion for eta field
197 12 : pp_query_default( "amr.refinement_criterion", value.m_refinement_criterion, "0.001",
198 : Unit::Less());
199 :
200 : // Refinement criterion for temperature field
201 12 : pp.query_default( "amr.refinement_criterion_temp", value.t_refinement_criterion, "0.001_K",
202 : Unit::Temperature());
203 :
204 : // Eta value to restrict the refinament for the temperature field
205 12 : pp.query_default( "amr.refinament_restriction", value.t_refinement_restriction, "0.1",
206 : Unit::Less());
207 :
208 : // Refinement criterion for phi field [infinity]
209 6 : pp_query_default("amr.phi_refinement_criterion", value.phi_refinement_criterion, 1.0e100);
210 :
211 : // Minimum allowable threshold for $\eta$
212 6 : pp_query_default("small", value.small, 1.0e-8);
213 :
214 : // Initial condition for $\phi$ field.
215 : pp.select_default<IC::Laminate,IC::Expression,IC::Constant,IC::BMP,IC::PNG, IC::PSRead>
216 6 : ("phi.ic",value.ic_phi,value.geom);
217 :
218 9 : value.RegisterNodalFab(value.phi_mf, 1, 2, "phi", true);
219 :
220 : // Whether to use Neo-hookean Elastic model
221 6 : pp_query_default("elastic.on", value.elastic.on, 0);
222 :
223 : // Body force
224 6 : pp_query_default("elastic.traction", value.elastic.traction, 0.0);
225 :
226 : // Phi refinement criteria
227 6 : pp_query_default("elastic.phirefinement", value.elastic.phirefinement, 1);
228 :
229 6 : pp.queryclass<Base::Mechanics<model_type>>("elastic",value);
230 :
231 3 : if (value.m_type != Type::Disable)
232 : {
233 : // Reference temperature for thermal expansion
234 : // (temperature at which the material is strain-free)
235 0 : pp_query_default("Telastic", value.elastic.Telastic, value.thermal.Tref);
236 : // elastic model of AP
237 0 : pp.queryclass<Model::Solid::Finite::NeoHookeanPredeformed>("model_ap", value.elastic.model_ap);
238 : // elastic model of HTPB
239 0 : pp.queryclass<Model::Solid::Finite::NeoHookeanPredeformed>("model_htpb", value.elastic.model_htpb);
240 :
241 : // Use our current eta field as the psi field for the solver
242 0 : value.psi_on = false;
243 0 : value.solver.setPsi(value.eta_mf);
244 : }
245 :
246 : bool allow_unused;
247 : // Set this to true to allow unused inputs without error.
248 : // (Not recommended.)
249 3 : pp.query_default("allow_unused",allow_unused,false);
250 3 : if (!allow_unused && pp.AnyUnusedInputs())
251 : {
252 0 : Util::Warning(INFO,"The following inputs were specified but not used:");
253 0 : pp.AllUnusedInputs();
254 0 : Util::Exception(INFO,"Aborting. Specify 'allow_unused=True` to ignore this error.");
255 : }
256 3 : }
257 :
258 14 : void Flame::Initialize(int lev)
259 : {
260 : BL_PROFILE("Integrator::Flame::Initialize");
261 14 : Base::Mechanics<model_type>::Initialize(lev);
262 :
263 14 : ic_eta->Initialize(lev, eta_mf);
264 14 : ic_eta->Initialize(lev, eta_old_mf);
265 14 : ic_phi->Initialize(lev, phi_mf);
266 : //ic_phicell->Initialize(lev, phicell_mf);
267 :
268 14 : if (elastic.on) {
269 0 : rhs_mf[lev]->setVal(Set::Vector::Zero());
270 : }
271 14 : if (thermal.on) {
272 8 : if (thermal.ic_temp)
273 : {
274 8 : thermal.ic_temp->Initialize(lev,temp_mf);
275 8 : thermal.ic_temp->Initialize(lev,temp_old_mf);
276 8 : thermal.ic_temp->Initialize(lev,temps_mf);
277 : }
278 : else
279 : {
280 0 : temp_mf[lev]->setVal(thermal.Tref);
281 0 : temp_old_mf[lev]->setVal(thermal.Tref);
282 0 : temps_mf[lev]->setVal(thermal.Tref);
283 : }
284 8 : alpha_mf[lev]->setVal(0.0);
285 8 : mdot_mf[lev]->setVal(0.0);
286 8 : heatflux_mf[lev]->setVal(0.0);
287 8 : ic_laser->Initialize(lev, laser_mf);
288 : }
289 14 : if (variable_pressure) chamber.pressure = 1.0;
290 14 : }
291 :
292 0 : void Flame::UpdateModel(int /*a_step*/, Set::Scalar /*a_time*/)
293 : {
294 0 : if (m_type == Base::Mechanics<model_type>::Type::Disable) return;
295 :
296 0 : for (int lev = 0; lev <= finest_level; ++lev)
297 : {
298 0 : amrex::Box domain = this->geom[lev].Domain();
299 0 : domain.convert(amrex::IntVect::TheNodeVector());
300 0 : const Set::Scalar* DX = geom[lev].CellSize();
301 :
302 0 : phi_mf[lev]->FillBoundary();
303 0 : eta_mf[lev]->FillBoundary();
304 0 : temp_mf[lev]->FillBoundary();
305 :
306 0 : for (MFIter mfi(*model_mf[lev], false); mfi.isValid(); ++mfi)
307 : {
308 0 : amrex::Box smallbox = mfi.nodaltilebox();
309 0 : amrex::Box bx = mfi.grownnodaltilebox() & domain;
310 0 : Set::Patch<model_type> model = model_mf.Patch(lev,mfi);
311 0 : Set::Patch<const Set::Scalar> phi = phi_mf.Patch(lev,mfi);
312 0 : Set::Patch<const Set::Scalar> eta = eta_mf.Patch(lev,mfi);
313 0 : Set::Patch<Set::Vector> rhs = rhs_mf.Patch(lev,mfi);
314 :
315 0 : if (elastic.on)
316 : {
317 0 : Set::Patch <const Set::Scalar> temp = temp_mf.Patch(lev,mfi);
318 0 : amrex::ParallelFor(smallbox, [=] AMREX_GPU_DEVICE(int i, int j, int k)
319 :
320 : {
321 0 : Set::Vector grad_eta = Numeric::CellGradientOnNode(eta, i, j, k, 0, DX);
322 :
323 0 : rhs(i, j, k) = (elastic.traction) * grad_eta;
324 :
325 0 : });
326 0 : amrex::ParallelFor(bx, [=] AMREX_GPU_DEVICE(int i, int j, int k)
327 : {
328 0 : Set::Scalar phi_avg = phi(i, j, k, 0);
329 0 : Set::Scalar temp_avg = Numeric::Interpolate::CellToNodeAverage(temp, i, j, k, 0);
330 0 : model_type model_ap = elastic.model_ap;
331 0 : model_ap.F0 -= Set::Matrix::Identity();
332 0 : model_ap.F0 *= (temp_avg - elastic.Telastic);
333 0 : model_ap.F0 += Set::Matrix::Identity();
334 0 : model_type model_htpb = elastic.model_htpb;
335 0 : model_htpb.F0 -= Set::Matrix::Identity();
336 0 : model_htpb.F0 *= (temp_avg - elastic.Telastic);
337 0 : model_htpb.F0 += Set::Matrix::Identity();
338 :
339 0 : model(i, j, k) = (model_ap * phi_avg + model_htpb * (1. - phi_avg));
340 0 : });
341 : }
342 : else
343 : {
344 0 : amrex::ParallelFor(bx, [=] AMREX_GPU_DEVICE(int i, int j, int k)
345 : {
346 0 : Set::Scalar phi_avg = Numeric::Interpolate::CellToNodeAverage(phi, i, j, k, 0);
347 : //phi_avg = phi(i,j,k,0);
348 0 : model_type model_ap = elastic.model_ap;
349 0 : model_ap.F0 *= Set::Matrix::Zero();
350 0 : model_type model_htpb = elastic.model_htpb;
351 0 : model_htpb.F0 *= Set::Matrix::Zero();
352 0 : model(i, j, k) = (model_ap * phi_avg + model_htpb * (1. - phi_avg));
353 0 : });
354 : }
355 0 : }
356 0 : Util::RealFillBoundary(*model_mf[lev], geom[lev]);
357 :
358 : }
359 : }
360 :
361 818 : void Flame::TimeStepBegin(Set::Scalar a_time, int a_iter)
362 : {
363 : BL_PROFILE("Integrator::Flame::TimeStepBegin");
364 818 : Base::Mechanics<model_type>::TimeStepBegin(a_time, a_iter);
365 818 : if (thermal.on) {
366 90 : for (int lev = 0; lev <= finest_level; ++lev)
367 80 : ic_laser->Initialize(lev, laser_mf, a_time);
368 : }
369 :
370 818 : if (a_time > thermal.end_initial_refine_time)
371 : {
372 9 : if (!end_initial_refine) {
373 9 : for (int lev = 0; lev <= finest_level; ++lev)
374 8 : Flame::Regrid(lev, a_time);
375 1 : end_initial_refine = 1;
376 : }
377 :
378 9 : prev_finest_ba = grids[finest_level];
379 9 : prev_finest_level = finest_level;
380 : }
381 818 : }
382 :
383 818 : void Flame::TimeStepComplete(Set::Scalar /*a_time*/, int /*a_iter*/)
384 : {
385 : BL_PROFILE("Integrator::Flame::TimeStepComplete");
386 818 : if (variable_pressure) {
387 : //Set::Scalar x_len = geom[0].ProbDomain().length(0);
388 : //Set::Scalar y_len = geom[0].ProbDomain().length(1);
389 : // Set::Scalar domain_area = x_len * y_len;
390 0 : Util::Message(INFO, "Mass = ", chamber.massflux);
391 0 : Util::Message(INFO, "Pressure = ", chamber.pressure);
392 : }
393 818 : }
394 :
395 8206 : void Flame::Advance(int lev, Set::Scalar time, Set::Scalar dt)
396 : {
397 : BL_PROFILE("Integrador::Flame::Advance");
398 8206 : Base::Mechanics<model_type>::Advance(lev, time, dt);
399 8206 : const Set::Scalar* DX = geom[lev].CellSize();
400 :
401 8206 : std::swap(eta_old_mf[lev], eta_mf[lev]);
402 :
403 : //
404 : // Chamber pressure update
405 : //
406 8206 : if (variable_pressure) {
407 0 : chamber.pressure = exp(0.00075 * chamber.massflux);
408 0 : if (chamber.pressure > 10.0) {
409 0 : chamber.pressure = 10.0;
410 : }
411 0 : else if (chamber.pressure <= 0.99) {
412 0 : chamber.pressure = 0.99;
413 : }
414 0 : elastic.traction = chamber.pressure;
415 : }
416 :
417 :
418 : //
419 : // Multi-well chemical potential
420 : //
421 : Numeric::Function::Polynomial<4> w( pf.w0,
422 : 0.0,
423 8206 : -5.0 * pf.w1 + 16.0 * pf.w12 - 11.0 * pf.w0,
424 8206 : 14.0 * pf.w1 - 32.0 * pf.w12 + 18.0 * pf.w0,
425 8206 : -8.0 * pf.w1 + 16.0 * pf.w12 - 8.0 * pf.w0);
426 8206 : Numeric::Function::Polynomial<3> dw = w.D();
427 :
428 8206 : propellant.set_pressure(chamber.pressure);
429 :
430 30068 : for (amrex::MFIter mfi(*eta_mf[lev], true); mfi.isValid(); ++mfi)
431 : {
432 21862 : const amrex::Box& bx = mfi.tilebox();
433 : // Phase fields
434 21862 : Set::Patch<Set::Scalar> etanew = eta_mf.Patch(lev,mfi);
435 21862 : Set::Patch<const Set::Scalar> eta = eta_old_mf.Patch(lev,mfi);
436 21862 : Set::Patch<const Set::Scalar> phi = phi_mf.Patch(lev,mfi);
437 : // Heat transfer fields
438 21862 : Set::Patch<const Set::Scalar> temp = temp_mf.Patch(lev,mfi);
439 21862 : Set::Patch<Set::Scalar> alpha = alpha_mf.Patch(lev,mfi);
440 21862 : Set::Patch<Set::Scalar> laser = laser_mf.Patch(lev,mfi);
441 : // Diagnostic fields
442 21862 : Set::Patch<Set::Scalar> mdot = mdot_mf.Patch(lev,mfi);
443 21862 : Set::Patch<Set::Scalar> heatflux = heatflux_mf.Patch(lev,mfi);
444 :
445 21862 : Set::Patch<Set::Scalar> exceeded_Tcutoff = thermal.has_exceeded_Tcutoff.Patch(lev, mfi);
446 21862 : Set::Scalar Tcutoff = thermal.Tcutoff;
447 :
448 :
449 21862 : amrex::ParallelFor(bx, [=] AMREX_GPU_DEVICE(int i, int j, int k)
450 : {
451 : //
452 : // CALCULATE PHI-AVERAGED QUANTITIES
453 : //
454 59108224 : Set::Scalar phi_avg = Numeric::Interpolate::NodeToCellAverage(phi, i, j, k, 0);
455 60856064 : Set::Scalar T = thermal.on ? temp(i,j,k) : NAN;
456 :
457 59108224 : Set::Scalar K = propellant.get_K(phi_avg);
458 :
459 59108224 : Set::Scalar rho = propellant.get_rho(phi_avg);
460 :
461 59108224 : Set::Scalar cp = propellant.get_cp(phi_avg);
462 :
463 : //
464 : // CALCULATE MOBILITY
465 : //
466 59108224 : Set::Scalar L = propellant.get_L( phi_avg, T);
467 :
468 : //
469 : // EVOLVE PHASE FIELD (ETA)
470 : //
471 :
472 59108224 : Set::Scalar eta_lap = Numeric::Laplacian(eta, i, j, k, 0, DX);
473 118216448 : Set::Scalar df_deta = ((pf.lambda / pf.eps) * dw(eta(i, j, k)) - pf.eps * pf.kappa * eta_lap);
474 :
475 59108224 : if (df_deta < 0) {
476 : // Prevent eta from increasing/healing. A bug was found where if the diffuse thickness was too large compared to a void
477 : // (region of eta = 0), eta would heal/increase in a non-physcial way, this statement stops that behavior
478 196236 : df_deta = 0.0;
479 : }
480 59108224 : if (thermal.on && T < thermal.Tcutoff) {
481 : // If the temperature is lower then the cutoff temperature don't evolve the eta field
482 0 : df_deta = 0.0;
483 : }
484 118216448 : etanew(i, j, k) = eta(i, j, k) - L * dt * df_deta;
485 :
486 118216448 : if (etanew(i, j, k) <= small) etanew(i, j, k) = small;
487 :
488 59108224 : if (thermal.on)
489 : {
490 : //
491 : // Calculate thermal diffisivity and store for later gradient
492 : //
493 :
494 1747840 : alpha(i, j, k) = K / rho / cp;
495 :
496 : //
497 : // CALCULATE MASS FLUX BASED ON EVOLVING ETA
498 : //
499 :
500 5243520 : mdot(i, j, k) = rho * fabs(eta(i, j, k) - etanew(i, j, k)) / dt;
501 :
502 : //
503 : // CALCULATE HEAT FLUX BASED ON THE CALCULATED MASS FLUX
504 : //
505 :
506 3495680 : Set::Scalar q0 = propellant.get_qdot(mdot(i,j,k), phi_avg);
507 3495680 : heatflux(i,j,k) = ( thermal.hc*q0 + laser(i,j,k) ) / K;
508 :
509 3495680 : if (temp(i,j,k) > Tcutoff)
510 : {
511 3495680 : exceeded_Tcutoff(i,j,k) = 1;
512 : }
513 :
514 : }
515 :
516 59108224 : });
517 :
518 8206 : } // MFi For loop
519 :
520 :
521 : //
522 : // THERMAL TRANSPORT
523 : //
524 8206 : if (thermal.on)
525 : {
526 2550 : std::swap(temp_old_mf[lev], temp_mf[lev]);
527 :
528 13100 : for (amrex::MFIter mfi(*eta_mf[lev], true); mfi.isValid(); ++mfi)
529 : {
530 10550 : const amrex::Box& bx = mfi.tilebox();
531 :
532 10550 : Set::Patch<Set::Scalar> tempnew = temp_mf.Patch(lev,mfi);
533 10550 : Set::Patch<const Set::Scalar> temp = temp_old_mf.Patch(lev,mfi);
534 10550 : Set::Patch<const Set::Scalar> alpha = alpha_mf.Patch(lev,mfi);
535 :
536 10550 : Set::Patch<Set::Scalar> temps = temps_mf.Patch(lev,mfi);
537 :
538 :
539 : // Phase field
540 10550 : Set::Patch<Set::Scalar> etanew = (*eta_mf[lev]).array(mfi);
541 10550 : Set::Patch<const Set::Scalar> eta = (*eta_old_mf[lev]).array(mfi);
542 : // Diagnostic fields
543 10550 : Set::Patch<const Set::Scalar> heatflux = heatflux_mf.Patch(lev,mfi);
544 :
545 10550 : amrex::ParallelFor(bx, [=] AMREX_GPU_DEVICE(int i, int j, int k)
546 : {
547 1747840 : auto sten = Numeric::GetStencil(i, j, k, bx);
548 1747840 : Set::Vector grad_eta = Numeric::Gradient(eta, i, j, k, 0, DX);
549 1747840 : Set::Vector grad_temp = Numeric::Gradient(temp, i, j, k, 0, DX);
550 1747840 : Set::Scalar lap_temp = Numeric::Laplacian(temp, i, j, k, 0, DX);
551 1747840 : Set::Scalar grad_eta_mag = grad_eta.lpNorm<2>();
552 1747840 : Set::Vector grad_alpha = Numeric::Gradient(alpha, i, j, k, 0, DX, sten);
553 1747840 : Set::Scalar dTdt = 0.0;
554 3495680 : dTdt += grad_eta.dot(grad_temp * alpha(i, j, k));
555 3495680 : dTdt += grad_alpha.dot(eta(i, j, k) * grad_temp);
556 3495680 : dTdt += eta(i, j, k) * alpha(i, j, k) * lap_temp;
557 3495680 : dTdt += alpha(i, j, k) * heatflux(i, j, k) * grad_eta_mag;
558 :
559 5243520 : Set::Scalar Tsolid = dTdt + temps(i, j, k) * (etanew(i, j, k) - eta(i, j, k)) / dt;
560 3495680 : temps(i, j, k) = temps(i, j, k) + dt * Tsolid;
561 6991360 : tempnew(i, j, k) = etanew(i, j, k) * temps(i, j, k) + (1.0 - etanew(i, j, k)) * thermal.Tfluid;
562 1747840 : });
563 2550 : }
564 : }
565 :
566 8206 : } //Function
567 :
568 :
569 190 : void Flame::TagCellsForRefinement(int lev, amrex::TagBoxArray& a_tags, Set::Scalar time, int ngrow)
570 : {
571 : BL_PROFILE("Integrator::Flame::TagCellsForRefinement");
572 190 : Base::Mechanics<model_type>::TagCellsForRefinement(lev, a_tags, time, ngrow);
573 :
574 190 : const Set::Scalar* DX = geom[lev].CellSize();
575 190 : Set::Scalar dr = sqrt(AMREX_D_TERM(DX[0] * DX[0], +DX[1] * DX[1], +DX[2] * DX[2]));
576 :
577 : // Eta criterion for refinement
578 602 : for (amrex::MFIter mfi(*eta_mf[lev], true); mfi.isValid(); ++mfi)
579 : {
580 412 : const amrex::Box& bx = mfi.tilebox();
581 412 : amrex::Array4<char> const& tags = a_tags.array(mfi);
582 412 : Set::Patch<const Set::Scalar> eta = eta_mf.Patch(lev,mfi);
583 412 : Set::Patch<const Set::Scalar> temp = temp_mf.Patch(lev,mfi);
584 :
585 412 : if (thermal.on) {
586 345 : amrex::ParallelFor(bx, [=] AMREX_GPU_DEVICE(int i, int j, int k)
587 : {
588 50928 : Set::Vector gradeta = Numeric::Gradient(eta, i, j, k, 0, DX);
589 76356 : if (gradeta.lpNorm<2>() * dr * 2 > m_refinement_criterion && eta(i, j, k) >= t_refinement_restriction && temp(i,j,k) > thermal.Tcutoff*0.9)
590 25428 : tags(i, j, k) = amrex::TagBox::SET;
591 50928 : });
592 :
593 : } else {
594 67 : amrex::ParallelFor(bx, [=] AMREX_GPU_DEVICE(int i, int j, int k)
595 : {
596 468992 : Set::Vector gradeta = Numeric::Gradient(eta, i, j, k, 0, DX);
597 477748 : if (gradeta.lpNorm<2>() * dr * 2 > m_refinement_criterion && eta(i, j, k) >= t_refinement_restriction)
598 16508 : tags(i, j, k) = amrex::TagBox::SET;
599 468992 : });
600 : }
601 190 : }
602 :
603 : // Phi criterion for refinement
604 190 : if (elastic.phirefinement) {
605 602 : for (amrex::MFIter mfi(*eta_mf[lev], true); mfi.isValid(); ++mfi)
606 : {
607 412 : const amrex::Box& bx = mfi.tilebox();
608 412 : amrex::Array4<char> const& tags = a_tags.array(mfi);
609 412 : Set::Patch<const Set::Scalar> phi = phi_mf.Patch(lev,mfi);
610 :
611 412 : amrex::ParallelFor(bx, [=] AMREX_GPU_DEVICE(int i, int j, int k)
612 : {
613 519920 : Set::Vector gradphi = Numeric::Gradient(phi, i, j, k, 0, DX);
614 519920 : if (gradphi.lpNorm<2>() * dr >= phi_refinement_criterion)
615 0 : tags(i, j, k) = amrex::TagBox::SET;
616 519920 : });
617 190 : }
618 : }
619 :
620 :
621 : // Thermal criterion for refinement
622 190 : if (thermal.on) {
623 507 : for (amrex::MFIter mfi(*temp_mf[lev], true); mfi.isValid(); ++mfi)
624 : {
625 345 : const amrex::Box& bx = mfi.tilebox();
626 345 : amrex::Array4<char> const& tags = a_tags.array(mfi);
627 345 : Set::Patch<const Set::Scalar> temp = temp_mf.Patch(lev,mfi);
628 345 : Set::Patch<const Set::Scalar> eta = eta_mf.Patch(lev,mfi);
629 345 : amrex::ParallelFor(bx, [=] AMREX_GPU_DEVICE(int i, int j, int k)
630 : {
631 50928 : Set::Vector tempgrad = Numeric::Gradient(temp, i, j, k, 0, DX);
632 50928 : if (tempgrad.lpNorm<2>() * dr > t_refinement_criterion && eta(i, j, k) >= t_refinement_restriction)
633 0 : tags(i, j, k) = amrex::TagBox::SET;
634 50928 : });
635 162 : }
636 : }
637 :
638 : // Refine at start
639 602 : for (amrex::MFIter mfi(*eta_mf[lev], true); mfi.isValid(); ++mfi)
640 : {
641 412 : const amrex::Box& bx = mfi.tilebox();
642 412 : amrex::Array4<char> const& tags = a_tags.array(mfi);
643 412 : Set::Patch<const Set::Scalar> eta = eta_mf.Patch(lev,mfi);
644 :
645 412 : amrex::ParallelFor(bx, [=] AMREX_GPU_DEVICE(int i, int j, int k)
646 : {
647 519920 : Set::Vector gradeta = Numeric::Gradient(eta, i, j, k, 0, DX);
648 519920 : if (gradeta.lpNorm<2>() * dr * 2 > m_refinement_criterion && time < thermal.end_initial_refine_time)
649 0 : tags(i, j, k) = amrex::TagBox::SET;
650 519920 : });
651 190 : }
652 190 : }
653 :
654 10 : void Flame::Regrid(int lev, Set::Scalar time)
655 : {
656 : BL_PROFILE("Integrator::Flame::Regrid");
657 :
658 10 : ic_phi->Initialize(lev, phi_mf, time);
659 10 : ic_eta->Initialize(lev, eta_0_mf, time);
660 :
661 10 : if (thermal.on) {
662 : /*
663 : This regrid function works by making a using the "has_exceeded_Tcutoff" field. If the temperature in a cell is greater than Tcutoff,
664 : eta will change and when regruding won't use the initial eta field. If T < T_cutoff, when regriding happens it applies the inital
665 : eta field condition. This gives at leat a 4x speed improvement in 2D when doing regression with voids. This is because orgioanlly
666 : there was a bug where when regridding, the orgional eta field wouldn't be applied, so there would be "sqaures" of voids instead of
667 : circles/spheres when using .xyzr files as the inital condition.
668 : */
669 24 : for (amrex::MFIter mfi(*eta_mf[lev], true); mfi.isValid(); ++mfi)
670 : {
671 16 : const amrex::Box &bx = mfi.tilebox();
672 16 : Set::Patch<Set::Scalar> eta = eta_mf.Patch(lev, mfi);
673 16 : Set::Patch<const Set::Scalar> temp = temp_mf.Patch(lev, mfi);
674 16 : Set::Patch<const Set::Scalar> eta_0 = eta_0_mf.Patch(lev, mfi);
675 16 : Set::Patch<Set::Scalar> exceeded_Tcutoff = thermal.has_exceeded_Tcutoff.Patch(lev, mfi);
676 :
677 16 : Set::Scalar Tcutoff = thermal.Tcutoff;
678 :
679 16 : amrex::BoxList boxes_to_update;
680 16 : if (lev == finest_level && prev_finest_level == finest_level)
681 0 : boxes_to_update = amrex::complementIn(bx, prev_finest_ba).boxList();
682 : else
683 16 : boxes_to_update.push_back(bx);
684 :
685 32 : for (const amrex::Box &box : boxes_to_update)
686 16 : amrex::ParallelFor(box, [=] AMREX_GPU_DEVICE(int i, int j, int k)
687 : {
688 :
689 4128 : if (!exceeded_Tcutoff(i,j,k) && temp(i,j,k) < Tcutoff)
690 : {
691 0 : eta(i, j, k) = eta_0(i, j, k);
692 : }
693 2064 : });
694 24 : }
695 :
696 8 : if (lev == finest_level)
697 : {
698 1 : prev_finest_ba = grids[finest_level];
699 1 : prev_finest_level = finest_level;
700 : }
701 : }
702 10 : }
703 :
704 220 : void Flame::Integrate(int amrlev, Set::Scalar time, int /*step*/,
705 : const amrex::MFIter& mfi, const amrex::Box& box)
706 : {
707 : BL_PROFILE("Flame::Integrate");
708 :
709 220 : Base::Mechanics<model_type>::Integrate(amrlev,time,timestep,mfi,box);
710 :
711 220 : const Set::Scalar* DX = geom[amrlev].CellSize();
712 220 : Set::Scalar dv = AMREX_D_TERM(DX[0], *DX[1], *DX[2]);
713 220 : Set::Patch<const Set::Scalar> eta = eta_mf.Patch(amrlev,mfi);
714 220 : Set::Patch<const Set::Scalar> mdot = mdot_mf.Patch(amrlev,mfi);
715 220 : if (variable_pressure) {
716 0 : amrex::ParallelFor(box, [=] AMREX_GPU_DEVICE(int i, int j, int k)
717 : {
718 0 : chamber.volume += eta(i, j, k, 0) * dv;
719 0 : Set::Vector grad = Numeric::Gradient(eta, i, j, k, 0, DX);
720 0 : Set::Scalar normgrad = grad.lpNorm<2>();
721 0 : Set::Scalar da = normgrad * dv;
722 0 : chamber.area += da;
723 :
724 0 : Set::Vector mgrad = Numeric::Gradient(mdot, i, j, k, 0, DX);
725 0 : Set::Scalar mnormgrad = mgrad.lpNorm<2>();
726 0 : Set::Scalar dm = mnormgrad * dv;
727 0 : chamber.massflux += dm;
728 :
729 0 : });
730 : }
731 : else {
732 220 : amrex::ParallelFor(box, [=] AMREX_GPU_DEVICE(int i, int j, int k)
733 : {
734 15560 : chamber.volume += eta(i, j, k, 0) * dv;
735 15560 : Set::Vector grad = Numeric::Gradient(eta, i, j, k, 0, DX);
736 15560 : Set::Scalar normgrad = grad.lpNorm<2>();
737 15560 : Set::Scalar da = normgrad * dv;
738 15560 : chamber.area += da;
739 15560 : });
740 : }
741 : // time dependent pressure data from experimenta -> p = 0.0954521220950523 * exp(15.289993148880678 * t)
742 220 : }
743 : } // namespace Integrator
744 :
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