Chaste Commit::ca8ccdedf819b6e02855bc0e8e6f50bdecbc5208
AbstractDynamicLinearPdeSolver.hpp
1
2/*
3
4Copyright (c) 2005-2024, University of Oxford.
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35*/
36
37#ifndef ABSTRACTDYNAMICLINEARPDESOLVER_HPP_
38#define ABSTRACTDYNAMICLINEARPDESOLVER_HPP_
39
40#include "Exception.hpp"
41#include "TimeStepper.hpp"
42#include "AbstractLinearPdeSolver.hpp"
43#include "PdeSimulationTime.hpp"
44#include "AbstractTimeAdaptivityController.hpp"
45#include "Hdf5DataWriter.hpp"
46#include "Hdf5ToVtkConverter.hpp"
47#include "Hdf5ToTxtConverter.hpp"
48
55template<unsigned ELEMENT_DIM, unsigned SPACE_DIM, unsigned PROBLEM_DIM>
56class AbstractDynamicLinearPdeSolver : public AbstractLinearPdeSolver<ELEMENT_DIM, SPACE_DIM, PROBLEM_DIM>
57{
58 friend class TestSimpleLinearParabolicSolver;
59protected:
60
62 double mTstart;
63
65 double mTend;
66
69
72
75
81
87
90
93
99
105
111
113 std::string mOutputDirectory;
114
116 std::string mFilenamePrefix;
117
124
127
129 std::vector<int> mVariableColumnIds;
130
136
143 void WriteOneStep(double time, Vec solution);
144
145public:
146
153
160 void SetTimes(double tStart, double tEnd);
161
167 void SetTimeStep(double dt);
168
177 void SetInitialCondition(Vec initialCondition);
178
182 virtual Vec Solve();
183
186
193
197 void SetOutputToVtk(bool output);
198
202 void SetOutputToParallelVtk(bool output);
203
207 void SetOutputToTxt(bool output);
208
213 void SetOutputDirectoryAndPrefix(std::string outputDirectory, std::string prefix);
214
219 void SetPrintingTimestepMultiple(unsigned multiple);
220};
221
222template<unsigned ELEMENT_DIM, unsigned SPACE_DIM, unsigned PROBLEM_DIM>
224{
225 // Check that everything is set up correctly
226 if ((mOutputDirectory=="") || (mFilenamePrefix==""))
227 {
228 EXCEPTION("Output directory or filename prefix has not been set");
229 }
230
231 // Create writer
232 mpHdf5Writer = new Hdf5DataWriter(*(this->mpMesh)->GetDistributedVectorFactory(),
233 mOutputDirectory,
234 mFilenamePrefix);
235
236 // Set writer to output all nodes
237 mpHdf5Writer->DefineFixedDimension((this->mpMesh)->GetNumNodes());
238
239 // Only used to get an estimate of the number of timesteps below
240 unsigned estimated_num_printing_timesteps = 1u + (unsigned)((mTend - mTstart)/(mIdealTimeStep*mPrintingTimestepMultiple));
241
248 assert(mVariableColumnIds.empty());
249 for (unsigned i=0; i<PROBLEM_DIM; i++)
250 {
251 std::stringstream variable_name;
252 variable_name << "Variable_" << i;
253 mVariableColumnIds.push_back(mpHdf5Writer->DefineVariable(variable_name.str(),"undefined"));
254 }
255 mpHdf5Writer->DefineUnlimitedDimension("Time", "undefined", estimated_num_printing_timesteps);
256
257 // End the define mode of the writer
258 mpHdf5Writer->EndDefineMode();
259}
260
261template<unsigned ELEMENT_DIM, unsigned SPACE_DIM, unsigned PROBLEM_DIM>
263 : AbstractLinearPdeSolver<ELEMENT_DIM, SPACE_DIM, PROBLEM_DIM>(pMesh),
264 mTimesSet(false),
265 mInitialCondition(nullptr),
266 mMatrixIsAssembled(false),
267 mMatrixIsConstant(false),
268 mIdealTimeStep(-1.0),
269 mLastWorkingTimeStep(-1),
270 mpTimeAdaptivityController(nullptr),
271 mOutputToVtk(false),
272 mOutputToParallelVtk(false),
273 mOutputToTxt(false),
274 mOutputDirectory(""),
275 mFilenamePrefix(""),
276 mPrintingTimestepMultiple(1),
277 mpHdf5Writer(nullptr)
278{
279}
280
281template<unsigned ELEMENT_DIM, unsigned SPACE_DIM, unsigned PROBLEM_DIM>
283{
284 mTstart = tStart;
285 mTend = tEnd;
286
287 if (mTstart >= mTend)
288 {
289 EXCEPTION("Start time has to be less than end time");
290 }
291
292 mTimesSet = true;
293}
294
295template<unsigned ELEMENT_DIM, unsigned SPACE_DIM, unsigned PROBLEM_DIM>
297{
298 if (dt <= 0)
299 {
300 EXCEPTION("Time step has to be greater than zero");
301 }
302
303 mIdealTimeStep = dt;
304}
305
306template<unsigned ELEMENT_DIM, unsigned SPACE_DIM, unsigned PROBLEM_DIM>
308{
309 assert(initialCondition != nullptr);
310 mInitialCondition = initialCondition;
311}
312
313template<unsigned ELEMENT_DIM, unsigned SPACE_DIM, unsigned PROBLEM_DIM>
315{
316 mpHdf5Writer->PutUnlimitedVariable(time);
317 if (PROBLEM_DIM == 1)
318 {
319 mpHdf5Writer->PutVector(mVariableColumnIds[0], solution);
320 }
321 else
322 {
323 mpHdf5Writer->PutStripedVector(mVariableColumnIds, solution);
324 }
325}
326
327template<unsigned ELEMENT_DIM, unsigned SPACE_DIM, unsigned PROBLEM_DIM>
329{
330 // Begin by checking that everything has been set up correctly
331 if (!mTimesSet)
332 {
333 EXCEPTION("SetTimes() has not been called");
334 }
335 if ((mIdealTimeStep <= 0.0) && (mpTimeAdaptivityController==nullptr))
336 {
337 EXCEPTION("SetTimeStep() has not been called");
338 }
339 if (mInitialCondition == nullptr)
340 {
341 EXCEPTION("SetInitialCondition() has not been called");
342 }
343
344 // If required, initialise HDF5 writer and output initial condition to HDF5 file
345 bool print_output = (mOutputToVtk || mOutputToParallelVtk || mOutputToTxt);
346 if (print_output)
347 {
348 InitialiseHdf5Writer();
349 WriteOneStep(mTstart, mInitialCondition);
350 mpHdf5Writer->AdvanceAlongUnlimitedDimension();
351 }
352
353 this->InitialiseForSolve(mInitialCondition);
354
355 if (mIdealTimeStep < 0) // hasn't been set, so a controller must have been given
356 {
357 mIdealTimeStep = mpTimeAdaptivityController->GetNextTimeStep(mTstart, mInitialCondition);
358 }
359
360 /*
361 * Note: we use the mIdealTimeStep here (the original timestep that was passed in, or
362 * the last timestep suggested by the controller), rather than the last timestep used
363 * (mLastWorkingTimeStep), because the timestep will be very slightly altered by the
364 * stepper in the final timestep of the last printing-timestep-loop, and these floating
365 * point errors can add up and eventually cause exceptions being thrown.
366 */
367 TimeStepper stepper(mTstart, mTend, mIdealTimeStep, mMatrixIsConstant);
368
369 Vec solution = mInitialCondition;
370 Vec next_solution;
371
372 while (!stepper.IsTimeAtEnd())
373 {
374 bool timestep_changed = false;
375
377
378 // Determine timestep to use
379 double new_dt;
380 if (mpTimeAdaptivityController)
381 {
382 // Get the timestep the controller wants to use and store it as the ideal timestep
383 mIdealTimeStep = mpTimeAdaptivityController->GetNextTimeStep(stepper.GetTime(), solution);
384
385 // Tell the stepper to use this timestep from now on...
386 stepper.ResetTimeStep(mIdealTimeStep);
387
388 // ..but now get the timestep from the stepper, as the stepper might need
389 // to trim the timestep if it would take us over the end time
390 new_dt = stepper.GetNextTimeStep();
391 // Changes in timestep bigger than 0.001% will trigger matrix re-computation
392 timestep_changed = (fabs(new_dt/mLastWorkingTimeStep - 1.0) > 1e-5);
393 }
394 else
395 {
396 new_dt = stepper.GetNextTimeStep();
397
398 //new_dt should be roughly the same size as mIdealTimeStep - we should never need to take a tiny step
399
400 if (mMatrixIsConstant && fabs(new_dt/mIdealTimeStep - 1.0) > 1e-5)
401 {
402 // Here we allow for changes of up to 0.001%
403 // Note that the TimeStepper guarantees that changes in dt are no bigger than DBL_EPSILON*current_time
405 }
406 }
407
408 // Save the timestep as the last one use, and also put it in PdeSimulationTime
409 // so everyone can see it
410 mLastWorkingTimeStep = new_dt;
412
413 // Solve
414 try
415 {
416 // (This runs the cell ODE models in heart simulations)
417 this->PrepareForSetupLinearSystem(solution);
418 }
419 catch(Exception& e)
420 {
421 // We only need to clean up memory if we are NOT on the first PDE time step,
422 // as someone else cleans up the mInitialCondition vector in higher classes.
423 if (solution != mInitialCondition)
424 {
425 HeartEventHandler::BeginEvent(HeartEventHandler::COMMUNICATION);
426 PetscTools::Destroy(solution);
427 HeartEventHandler::EndEvent(HeartEventHandler::COMMUNICATION);
428 }
429 throw e;
430 }
431
432 bool compute_matrix = (!mMatrixIsConstant || !mMatrixIsAssembled || timestep_changed);
433
434 this->SetupLinearSystem(solution, compute_matrix);
435
436 this->FinaliseLinearSystem(solution);
437
438 if (compute_matrix)
439 {
440 this->mpLinearSystem->ResetKspSolver();
441 }
442
443 next_solution = this->mpLinearSystem->Solve(solution);
444
445 if (mMatrixIsConstant)
446 {
447 mMatrixIsAssembled = true;
448 }
449
450 this->FollowingSolveLinearSystem(next_solution);
451
452 stepper.AdvanceOneTimeStep();
453
454 // Avoid memory leaks
455 if (solution != mInitialCondition)
456 {
457 HeartEventHandler::BeginEvent(HeartEventHandler::COMMUNICATION);
458 PetscTools::Destroy(solution);
459 HeartEventHandler::EndEvent(HeartEventHandler::COMMUNICATION);
460 }
461 solution = next_solution;
462
463 // If required, output next solution to HDF5 file
464 if (print_output && (stepper.GetTotalTimeStepsTaken()%mPrintingTimestepMultiple == 0) )
465 {
466 WriteOneStep(stepper.GetTime(), solution);
467 mpHdf5Writer->AdvanceAlongUnlimitedDimension();
468 }
469 }
470
471 // Avoid memory leaks
472 if (mpHdf5Writer != nullptr)
473 {
474 delete mpHdf5Writer;
475 mpHdf5Writer = nullptr;
476 }
477
478 // Convert HDF5 output to other formats as required
479
480 if (mOutputToVtk)
481 {
483 mFilenamePrefix, this->mpMesh, false, false);
484 }
485 if (mOutputToParallelVtk)
486 {
488 mFilenamePrefix, this->mpMesh, true, false);
489 }
490 if (mOutputToTxt)
491 {
493 mFilenamePrefix, this->mpMesh);
494 }
495
496 return solution;
497}
498
499template<unsigned ELEMENT_DIM, unsigned SPACE_DIM, unsigned PROBLEM_DIM>
504
505template<unsigned ELEMENT_DIM, unsigned SPACE_DIM, unsigned PROBLEM_DIM>
507{
508 assert(pTimeAdaptivityController != nullptr);
509 assert(mpTimeAdaptivityController == NULL);
510 mpTimeAdaptivityController = pTimeAdaptivityController;
511}
512
513template<unsigned ELEMENT_DIM, unsigned SPACE_DIM, unsigned PROBLEM_DIM>
518
519template<unsigned ELEMENT_DIM, unsigned SPACE_DIM, unsigned PROBLEM_DIM>
521{
522 mOutputToParallelVtk = output;
523}
524
525template<unsigned ELEMENT_DIM, unsigned SPACE_DIM, unsigned PROBLEM_DIM>
530
531template<unsigned ELEMENT_DIM, unsigned SPACE_DIM, unsigned PROBLEM_DIM>
533{
534 mOutputDirectory = outputDirectory;
535 mFilenamePrefix = prefix;
536}
537
538template<unsigned ELEMENT_DIM, unsigned SPACE_DIM, unsigned PROBLEM_DIM>
540{
541 mPrintingTimestepMultiple = multiple;
542}
543
544#endif /*ABSTRACTDYNAMICLINEARPDESOLVER_HPP_*/
#define EXCEPTION(message)
#define NEVER_REACHED
AbstractDynamicLinearPdeSolver(AbstractTetrahedralMesh< ELEMENT_DIM, SPACE_DIM > *pMesh)
void SetTimes(double tStart, double tEnd)
void SetTimeAdaptivityController(AbstractTimeAdaptivityController *pTimeAdaptivityController)
void SetOutputDirectoryAndPrefix(std::string outputDirectory, std::string prefix)
void WriteOneStep(double time, Vec solution)
AbstractTimeAdaptivityController * mpTimeAdaptivityController
static void SetPdeTimeStepAndNextTime(double timestep, double next_time)
static void SetTime(double time)
static void Destroy(Vec &rVec)
void ResetTimeStep(double dt)
double GetNextTimeStep()
bool IsTimeAtEnd() const
unsigned GetTotalTimeStepsTaken() const
double GetTime() const
void AdvanceOneTimeStep()
double GetNextTime() const