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Started with 3D particle tracing

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This commit is contained in:
Aditya Ujeniya 2023-08-14 11:31:22 +02:00
parent 13ef17ad35
commit 3d90befbff
5 changed files with 304 additions and 0 deletions
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7
BasicSolver/3D-seq/src/main.c
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@ -16,6 +16,8 @@
#include "solver.h" #include "solver.h"
#include "timing.h" #include "timing.h"
#include "vtkWriter.h" #include "vtkWriter.h"
#include "particletracing.h"
#define G(v, i, j, k) v[(k) * (imax + 2) * (jmax + 2) + (j) * (imax + 2) + (i)] #define G(v, i, j, k) v[(k) * (imax + 2) * (jmax + 2) + (j) * (imax + 2) + (i)]
@ -90,6 +92,8 @@ int main(int argc, char** argv)
} }
printParameter(&params); printParameter(&params);
initSolver(&s, &params); initSolver(&s, &params);
initParticleTracer(&particletracer, &params);
printParticleTracerParameters(&particletracer);
#ifndef VERBOSE #ifndef VERBOSE
initProgress(s.te); initProgress(s.te);
#endif #endif
@ -110,6 +114,9 @@ int main(int argc, char** argv)
computeRHS(&s); computeRHS(&s);
solver_generic[variant - 1](&s); solver_generic[variant - 1](&s);
adaptUV(&s); adaptUV(&s);
trace(&particletracer, &solver, s.u, s.v, s.w, t);
t += s.dt; t += s.dt;
#ifdef VERBOSE #ifdef VERBOSE

13
BasicSolver/3D-seq/src/parameter.c
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@ -88,6 +88,19 @@ void readParameter(Parameter* param, const char* filename)
PARSE_REAL(w_init); PARSE_REAL(w_init);
PARSE_REAL(p_init); PARSE_REAL(p_init);
PARSE_REAL(rho); PARSE_REAL(rho);
/* Added new particle tracing parameters */
PARSE_INT(numberOfParticles);
PARSE_REAL(startTime);
PARSE_REAL(injectTimePeriod);
PARSE_REAL(writeTimePeriod);
PARSE_REAL(x1);
PARSE_REAL(y1);
PARSE_REAL(z1);
PARSE_REAL(x2);
PARSE_REAL(y2);
PARSE_REAL(z2);
} }
} }

5
BasicSolver/3D-seq/src/parameter.h
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@ -18,6 +18,11 @@ typedef struct {
char* name; char* name;
int bcLeft, bcRight, bcBottom, bcTop, bcFront, bcBack; int bcLeft, bcRight, bcBottom, bcTop, bcFront, bcBack;
double u_init, v_init, w_init, p_init; double u_init, v_init, w_init, p_init;
int numberOfParticles;
double startTime, injectTimePeriod, writeTimePeriod;
double x1, y1, z1, x2, y2, z2;
} Parameter; } Parameter;
void initParameter(Parameter*); void initParameter(Parameter*);

232
BasicSolver/3D-seq/src/particletracing.c Normal file
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@ -0,0 +1,232 @@
/*
* Copyright (C) 2022 NHR@FAU, University Erlangen-Nuremberg.
* All rights reserved. This file is part of nusif-solver.
* Use of this source code is governed by a MIT style
* license that can be found in the LICENSE file.
*/
#include <float.h>
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "vtkWriter.h"
#define U(i, j, k) u[(k) * (imax + 2) * (jmax + 2) + (j) * (imax + 2) + (i)]
#define V(i, j, k) v[(k) * (imax + 2) * (jmax + 2) + (j) * (imax + 2) + (i)]
#define W(i, j, k) w[(k) * (imax + 2) * (jmax + 2) + (j) * (imax + 2) + (i)]
static int ts = 0;
void printParticles(ParticleTracer* particletracer)
{
for(int i = 0; i < particletracer->totalParticles; ++i)
{
printf("Particle position X : %.2f, Y : %.2f, flag : %d\n", particletracer->particlePool[i].x,
particletracer->particlePool[i].y,
particletracer->particlePool[i].flag);
}
}
void injectParticles(ParticleTracer* particletracer)
{
for(int i = 0; i < particletracer->numberOfParticles; ++i)
{
particletracer->particlePool[particletracer->pointer].x = particletracer->linSpaceLine[i].x;
particletracer->particlePool[particletracer->pointer].y = particletracer->linSpaceLine[i].y;
particletracer->particlePool[particletracer->pointer].flag = true;
++(particletracer->pointer);
++(particletracer->totalParticles);
}
}
void advanceParticles(ParticleTracer* particletracer, double* restrict u, double* restrict v, double time)
{
int imax = particletracer->imax;
int jmax = particletracer->jmax;
double dx = particletracer->dx;
double dy = particletracer->dy;
double xlength = particletracer->xlength;
double ylength = particletracer->ylength;
for(int i = 0; i < particletracer->totalParticles; ++i)
{
if(particletracer->particlePool[i].flag == true)
{
double x = particletracer->particlePool[i].x;
double y = particletracer->particlePool[i].y;
int iCoord = (int)(x / dx) + 1;
int jCoord = (int)((y + 0.5 * dy) / dy) + 1;
double x1 = (double)(iCoord - 1) * dx;
double y1 = ((double)(jCoord - 1) - 0.5) * dy;
double x2 = (double)iCoord * dx;
double y2 = ((double)jCoord - 0.5) * dy;
double u_n = (1.0 / (dx * dy)) *
((x2 - x) * (y2 - y) * U(iCoord - 1, jCoord - 1) +
(x - x1) * (y2 - y) * U(iCoord, jCoord - 1) +
(x2 - x) * (y - y1) * U(iCoord - 1, jCoord) +
(x - x1) * (y - y1) * U(iCoord, jCoord));
double new_x = x + particletracer->dt * u_n;
particletracer->particlePool[i].x = new_x;
iCoord = (int)((x + 0.5 * dx) / dx) + 1;
jCoord = (int)(y / dy) + 1;
x1 = ((double)(iCoord - 1) - 0.5) * dx;
y1 = (double)(jCoord - 1) * dy;
x2 = ((double)iCoord - 0.5) * dx;
y2 = (double)jCoord * dy;
double v_n = (1.0 / (dx * dy)) *
((x2 - x) * (y2 - y) * V(iCoord - 1, jCoord - 1) +
(x - x1) * (y2 - y) * V(iCoord, jCoord - 1) +
(x2 - x) * (y - y1) * V(iCoord - 1, jCoord) +
(x - x1) * (y - y1) * V(iCoord, jCoord));
double new_y = y + particletracer->dt * v_n;
particletracer->particlePool[i].y = new_y;
// printf("\tOld X : %.2f, New X : %.2f, iCoord : %d\n\tOld Y : %.2f, New Y : %.2f, jCoord : %d\n\n", x, new_x, iCoord, y, new_y, jCoord);
// printf("\tU(iCoord - 1, jCoord - 1) : %.2f, U(iCoord, jCoord - 1) : %.2f, U(iCoord - 1, jCoord) : %.2f, U(iCoord, jCoord) : %.2f\n", U(iCoord - 1, jCoord - 1), U(iCoord, jCoord - 1), U(iCoord - 1, jCoord), U(iCoord, jCoord));
// printf("\tV(iCoord - 1, jCoord - 1) : %.2f, V(iCoord, jCoord - 1) : %.2f, V(iCoord - 1, jCoord) : %.2f, V(iCoord, jCoord) : %.2f\n\n", V(iCoord - 1, jCoord - 1), V(iCoord, jCoord - 1), V(iCoord - 1, jCoord), V(iCoord, jCoord));
// printf("\t U N : %.2f, V N : %.2f\n\n", u_n, v_n);
// printf("\t j-1 * (imax + 2) + i-1 = %d with element from U : %.2f", (jCoord - 1) * (200 + 2) + (iCoord - 1), u[(jCoord - 1) * (imax + 2) + (iCoord - 1)]);
// printf("\nimax : %d, jmax : %d\n", imax, jmax);
if (((new_x < 0.0) || (new_x > xlength) || (new_y < 0.0) || (new_y > ylength)))
{
particletracer->particlePool[i].flag = false;
}
}
}
}
void freeParticles(ParticleTracer* particletracer)
{
free(particletracer->particlePool);
free(particletracer->linSpaceLine);
}
void writeParticles(ParticleTracer* particletracer, Solver* solver)
{
VtkOptions opts = { .solver = solver, .particletracer = particletracer };
char filename[50];
snprintf(filename, 50, "vtk_files/particles%d.vtk", ts);
vtkOpen(&opts, filename, ts);
vtkParticle(&opts, "particle");
vtkClose(&opts);
FILE* fp;
Particle* particlePool = particletracer->particlePool;
snprintf(filename, 50, "vis_files/particles_%d.dat", ts);
fp = fopen(filename, "w");
if (fp == NULL) {
printf("Error!\n");
exit(EXIT_FAILURE);
}
for (int i = 0; i < particletracer->totalParticles; ++i)
{
if(particlePool[i].flag == true)
{
double x = particlePool[i].x;
double y = particlePool[i].y;
fprintf(fp, "%f %f\n", x, y);
}
}
fclose(fp);
++ts;
}
void initParticleTracer(ParticleTracer* particletracer, Parameter* params)
{
particletracer->numberOfParticles = params->numberOfParticles;
particletracer->startTime = params->startTime;
particletracer->injectTimePeriod = params->injectTimePeriod;
particletracer->writeTimePeriod = params->writeTimePeriod;
particletracer->dt = params->dt;
particletracer->dx = params->xlength / params->imax;
particletracer->dy = params->ylength / params->jmax;
particletracer->dz = params->zlength / params->kmax;
particletracer->xlength = params->xlength;
particletracer->ylength = params->ylength;
particletracer->zlength = params->zlength;
particletracer->x1 = params->x1;
particletracer->y1 = params->y1;
particletracer->z1 = params->z1;
particletracer->x2 = params->x2;
particletracer->y2 = params->y2;
particletracer->z2 = params->z2;
particletracer->lastInjectTime = params->startTime;
particletracer->lastUpdateTime = params->startTime;
particletracer->lastWriteTime = params->startTime;
particletracer->pointer = 0;
particletracer->totalParticles = 0;
particletracer->imax = params->imax;
particletracer->jmax = params->jmax;
particletracer->kmax = params->kmax;
particletracer->estimatedNumParticles = ((params->te - params->startTime) + 2 ) * params->numberOfParticles;
particletracer->particlePool = malloc(sizeof(Particle) * particletracer->estimatedNumParticles);
particletracer->linSpaceLine = malloc(sizeof(Particle) * particletracer->numberOfParticles);
for (int i = 0; i < particletracer->numberOfParticles; ++i)
{
double spacing = (double)i / (double)(particletracer->numberOfParticles - 1);
particletracer->linSpaceLine[i].x = spacing * particletracer->x1 + (1.0 - spacing) * particletracer->x2;
particletracer->linSpaceLine[i].y = spacing * particletracer->y1 + (1.0 - spacing) * particletracer->y2;
particletracer->linSpaceLine[i].z = spacing * particletracer->z1 + (1.0 - spacing) * particletracer->z2;
particletracer->linSpaceLine[i].flag = true;
}
}
void printParticleTracerParameters(ParticleTracer* particletracer)
{
printf("Particle Tracing data:\n");
printf("\tNumber of particles : %d being injected for every period of %.2f\n", particletracer->numberOfParticles, particletracer->injectTimePeriod);
printf("\tstartTime : %.2f\n", particletracer->startTime);
printf("\t(Line along which the particles are to be injected) \n\tx1 : %.2f, y1 : %.2f, z1 : %.2f, x2 : %.2f, y2 : %.2f, z2 : %.2f\n", particletracer->x1, particletracer->y1, particletracer->z1, particletracer->x2, particletracer->y2, particletracer->z2);
printf("\tPointer : %d, TotalParticles : %d\n", particletracer->pointer, particletracer->totalParticles);
printf("\tdt : %.2f, dx : %.2f, dy : %.2f, dz : %.2f\n", particletracer->dt, particletracer->dx, particletracer->dy, particletracer->dz);
}
void trace(ParticleTracer* particletracer, Solver* solver, double* u, double* v, double* w, double time)
{
if (time >= particletracer->startTime)
{
//printParticles(particletracer);
if( (time - particletracer->lastInjectTime) >= particletracer->injectTimePeriod)
{
injectParticles(particletracer);
particletracer->lastInjectTime = time;
}
if( (time - particletracer->lastWriteTime) >= particletracer->writeTimePeriod)
{
writeParticles(particletracer, solver);
particletracer->lastWriteTime = time;
}
advanceParticles(particletracer, u, v, w, time);
particletracer->lastUpdateTime = time;
}
}

47
BasicSolver/3D-seq/src/particletracing.h Normal file
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@ -0,0 +1,47 @@
/*
* Copyright (C) 2022 NHR@FAU, University Erlangen-Nuremberg.
* All rights reserved. This file is part of nusif-solver.
* Use of this source code is governed by a MIT style
* license that can be found in the LICENSE file.
*/
#ifndef __PARTICLETRACING_H_
#define __PARTICLETRACING_H_
#include "allocate.h"
#include "parameter.h"
#include "solver.h"
#include "particletracing.h"
#include <stdbool.h>
typedef enum COORD { X = 0, Y, NCOORD } COORD;
typedef struct
{
double x, y, z;
bool flag;
} Particle;
typedef struct {
int numberOfParticles, totalParticles;
double startTime, injectTimePeriod, writeTimePeriod, lastInjectTime, lastUpdateTime, lastWriteTime;
int estimatedNumParticles;
double dx, dy, dz, dt;
Particle* linSpaceLine;
Particle* particlePool;
int pointer;
double imax, jmax, kmax, xlength, ylength, zlength;
double x1, y1, x2, y2, z1, z2;
} ParticleTracer;
void initParticleTracer(ParticleTracer*, Parameter*);
void injectParticles(ParticleTracer*);
void advanceParticles(ParticleTracer*, double* , double*, double*, double);
void freeParticles(ParticleTracer*);
void writeParticles(ParticleTracer*, Solver*);
void printParticleTracerParameters(ParticleTracer*);
void printParticles(ParticleTracer*);
void trace(ParticleTracer*, Solver*, double* , double* , double* , double);
#endif