void LogResSolver3D::vel_step ()
{
if(m_nbIter > m_nbMaxIter)
return;
add_source (m_u, m_uSrc);
add_source (m_v, m_vSrc);
add_source (m_w, m_wSrc);
addVorticityConfinement(m_u,m_v,m_w);
SWAP (m_uPrev, m_u);
diffuse (1, m_u, m_uPrev, m_aVisc);
SWAP (m_vPrev, m_v);
diffuse (2, m_v, m_vPrev, m_aVisc);
SWAP (m_wPrev, m_w);
diffuse (3, m_w, m_wPrev, m_aVisc);
m_index = 0;
project (m_uPrev, m_vPrev);
SWAP (m_uPrev, m_u);
SWAP (m_vPrev, m_v);
SWAP (m_wPrev, m_w);
advect (1, m_u, m_uPrev, m_uPrev, m_vPrev, m_wPrev);
advect (2, m_v, m_vPrev, m_uPrev, m_vPrev, m_wPrev);
advect (3, m_w, m_wPrev, m_uPrev, m_vPrev, m_wPrev);
m_index = 1;
project (m_uPrev, m_vPrev);
if(m_nbIter == m_nbMaxIter)
cout << "Simulation over" << endl;
}
//-----------------------------------------------------------------------------
void StamFluidSolver::vel_step ( float * u, float * v, float * u0, float * v0, float visc, float dt )
{
addSource ( u, u0, dt );
addSource ( v, v0, dt );
#if (VORTICITY_CONFINEMENT == 1)
if(mUseVorticityConfinement)
{
// add in vorticity confinement force
vorticityConfinement(u0, v0);
addSource ( u, u0, dt );
addSource ( v, v0, dt );
}
#endif
#if 0
// add in temperature force
if(mSimulateTemperature)
{
heatRise(v0);
addSource ( v, v0, dt );
}
#endif
SWAP ( u0, u );
diffuse ( 1, u, u0, visc, dt );
SWAP ( v0, v );
diffuse ( 2, v, v0, visc, dt );
project ( u, v, u0, v0 );
SWAP ( u0, u );
SWAP ( v0, v );
advect ( 1, u, u0, u0, v0, dt );
advect ( 2, v, v0, u0, v0, dt );
project ( u, v, u0, v0 );
}
void vel_step
( int step
, int method
, int iters, int N
, float* u, float* v
, float* u0, float* v0
, float visc, float dt)
{
add_source ( N, u, u0, dt );
add_source ( N, v, v0, dt );
SWAP (u0, u);
diffuse (method, iters, N, 1, u, u0, visc, dt);
SWAP (v0, v);
diffuse (method, iters, N, 2, v, v0, visc, dt);
project (method, iters, N, u, v, u0, v0);
SWAP (u0, u);
SWAP (v0, v);
advect (N, 1, u, u0, u0, v0, dt);
advect (N, 2, v, v0, u0, v0, dt);
project (method, iters, N, u, v, u0, v0);
}
/*
Function for setting up and running the fluid simulation kernels
*/
void solveFluid(struct Configuration* config) {
// Jacobi settings
float alpha = -1.0f;
// Should use alpha -1 here, but this gives nicer results
//float alpha = -(1.0f/invhalfgridscale);
float rbeta = 0.25;
int iterations = 100;
// grid scaling. this is currently not used
if(rank == 0){
float gridscale = 1.0f;
float invgridscale = 1.0f/gridscale;
float invhalfgridscale = 0.5f/gridscale;
// Timstep value
float timestep = 0.05f;
// Emitter settings
float amount = 2.0f;
float radius = 0.5*config->N/10.0f;
float emitterposx = config->N/2;
float emitterposy = config->N/3;
// buoyancy settings
float bdiry = 1.0f;
float bdirx = 0.0f;
float bstrength = 0.1f;
// advection settings
float veldamp = 0.01f;
// Velocity advection
float *tmp = config->velx0; config->velx0 = config->velx; config->velx = tmp;
float *tmp1 = config->vely0; config->vely0 = config->vely; config->vely = tmp1;
advect(config->N, config->velx, config->velx0, config->velx0, config->vely0, timestep, veldamp, 1);
advect(config->N, config->vely, config->vely0, config->velx0, config->vely0, timestep, veldamp, 2);
// Density advection
float *tmp2 = config->dens0; config->dens0 = config->dens; config->dens = tmp2;
advect(config->N, config->dens, config->dens0, config->velx, config->vely, timestep, 0.0f, 0);
// Add density and density buoyancy
addDensity(config->N, config->dens, timestep, emitterposx, emitterposy, radius, amount);
addDensityBuoyancy(config->N, config->velx, config->vely, config->dens, bdirx, bdiry, bstrength, timestep);
// Divergence calculation
divergence(config->N, config->velx, config->vely, config->div);
// Pressure jacobi calculation. First set pres array to zero as initial guess
setMem(config->N, config->pres);
}
jacobi(iterations);
if(rank == 0){
// Calculate projection
projection(config->N, config->velx, config->vely, config->pres);
}
}
///////////////////////////////////////////////////////////////////////////////
/// Calculate the velocity
///
///\param para Pointer to FFD parameters
///\param var Pointer to FFD simulation variables
///\param BINDEX Pointer to boundary index
///
///\return 0 if no error occurred
///////////////////////////////////////////////////////////////////////////////
int vel_step(PARA_DATA *para, REAL **var,int **BINDEX) {
REAL *u = var[VX], *v = var[VY], *w = var[VZ];
REAL *u0 = var[TMP1], *v0 = var[TMP2], *w0 = var[TMP3];
int flag = 0;
flag = advect(para, var, VX, 0, u0, u, BINDEX);
if(flag!=0) {
ffd_log("vel_step(): Could not advect for velocity X.", FFD_ERROR);
return flag;
}
flag = advect(para, var, VY, 0, v0, v, BINDEX);
if(flag!=0) {
ffd_log("vel_step(): Could not advect for velocity Y.", FFD_ERROR);
return flag;
}
flag = advect(para, var, VZ, 0, w0, w, BINDEX);
if(flag!=0) {
ffd_log("vel_step(): Could not advect for velocity Z.", FFD_ERROR);
return flag;
}
flag = diffusion(para, var, VX, 0, u, u0, BINDEX);
if(flag!=0) {
ffd_log("vel_step(): Could not diffuse velocity X.", FFD_ERROR);
return flag;
}
flag = diffusion(para, var, VY, 0, v, v0, BINDEX);
if(flag!=0) {
ffd_log("vel_step(): Could not diffuse velocity Y.", FFD_ERROR);
return flag;
}
flag = diffusion(para, var, VZ, 0, w, w0, BINDEX);
if(flag!=0) {
ffd_log("vel_step(): Could not diffuse velocity Z.", FFD_ERROR);
return flag;
}
flag = project(para, var,BINDEX);
if(flag!=0) {
ffd_log("vel_step(): Could not project velocity.", FFD_ERROR);
return flag;
}
if(para->bc->nb_outlet!=0) flag = mass_conservation(para, var,BINDEX);
if(flag!=0) {
ffd_log("vel_step(): Could not conduct mass conservation correction.",
FFD_ERROR);
return flag;
}
return flag;
} // End of vel_step( )
void CompResAvgSolver3D::vel_step ()
{
if(m_nbIter > m_nbMaxIter)
if(m_omegaDiff < 1.9)
{
char file[100];
m_omegaDiff += 0.1;
m_omegaProj += 0.1;
sprintf(file, "logs/%2.1f/residualsAverage.log", m_omegaDiff);
cout << "Processing " << file << endl;
m_file.open (file, ios::out | ios::trunc);
if (!m_file.is_open ())
cerr << "Can't open file " << file << endl;
m_nbIter = 0;
m_perturbateCount = 0;
}
else
return;
add_source (m_u, m_uSrc);
add_source (m_v, m_vSrc);
add_source (m_w, m_wSrc);
addVorticityConfinement(m_u,m_v,m_w);
SWAP (m_uPrev, m_u);
diffuse (1, m_u, m_uPrev, m_aVisc);
SWAP (m_vPrev, m_v);
diffuse (2, m_v, m_vPrev, m_aVisc);
SWAP (m_wPrev, m_w);
diffuse (3, m_w, m_wPrev, m_aVisc);
m_index = NB_DIFF_LOGS;
project (m_uPrev, m_vPrev);
SWAP (m_uPrev, m_u);
SWAP (m_vPrev, m_v);
SWAP (m_wPrev, m_w);
advect (1, m_u, m_uPrev, m_uPrev, m_vPrev, m_wPrev);
advect (2, m_v, m_vPrev, m_uPrev, m_vPrev, m_wPrev);
advect (3, m_w, m_wPrev, m_uPrev, m_vPrev, m_wPrev);
m_index = NB_DIFF_LOGS+1;
project (m_uPrev, m_vPrev);
if(m_nbIter == m_nbMaxIter){
for(uint i=0; i <= m_nbSteps; i++){
m_file << i << " ";
for(uint j=0; j < (NB_PROJ_LOGS+NB_DIFF_LOGS) ; j++)
m_file << m_averages[j*(m_nbSteps+1) + i] << " ";
m_file << endl;
}
cout << "Simulation over" << endl;
m_file.close ();
}
}
void vel_step(int width, int height, float *u, float *v, float *u0, float *v0, float visc, float dt)
{
add_source(width, height, u, u0, dt); add_source(width, height, v, v0, dt);
SWAP(u0, u); diffuse(width, height, 1, u, u0, visc, dt);
SWAP(v0, v); diffuse(width, height, 2, v, v0, visc, dt);
project(width, height, u, v, u0, v0);
SWAP(u0, u); SWAP(v0, v);
advect(width, height, 1, u, u0, u0, v0, dt); advect(width, height, 2, v, v0, u0, v0, dt);
project(width, height, u, v, u0, v0);
}
void update_velocity(gaszone_type *gz, float * u, float * v, float * u0, float * v0, float visc, float dt ) {
add_source (gz, u, u0, dt );
add_source (gz, v, v0, dt );
SWAP ( u0, u ); diffuse (gz, 1, u, u0, visc, dt );
SWAP ( v0, v ); diffuse (gz, 2, v, v0, visc, dt );
project (gz, u, v, u0, v0 );
SWAP ( u0, u ); SWAP ( v0, v );
advect (gz, 1, u, u0, u0, v0, dt ); advect (gz, 2, v, v0, u0, v0, dt );
project (gz, u, v, u0, v0 );
}
void update_velocity( float * u, float * v, float * u0, float * v0, float visc, float dt ) {
add_source ( u, u0, dt );
add_source ( v, v0, dt );
SWAP ( u0, u ); diffuse ( 1, u, u0, visc, dt );
SWAP ( v0, v ); diffuse ( 2, v, v0, visc, dt );
project ( u, v, u0, v0 );
SWAP ( u0, u ); SWAP ( v0, v );
advect ( 1, u, u0, u0, v0, dt ); advect ( 2, v, v0, u0, v0, dt );
project ( u, v, u0, v0 );
}
///////////////////////////////////////////////////////////////////////////////
/// Calculate the contaminant concentration
///
///\param para Pointer to FFD parameters
///\param var Pointer to FFD simulation variables
///\param BINDEX Pointer to boundary index
///
///\return 0 if no error occurred
///////////////////////////////////////////////////////////////////////////////
int den_step(PARA_DATA *para, REAL **var, int **BINDEX) {
REAL *den, *den0 = var[TMP1];
int i, flag = 0;
/****************************************************************************
| Solve the species
****************************************************************************/
for(i=0; i<para->bc->nb_Xi; i++) {
if(para->outp->version==DEBUG) {
sprintf(msg, "den_step(): start to solve Xi%d", i+1);
ffd_log(msg, FFD_NORMAL);
}
den = var[Xi1+i];
flag = advect(para, var, Xi1+i, i, den0, den, BINDEX);
if(flag!=0) {
sprintf(msg, "den_step(): Could not advect species %d", i+1);
ffd_log(msg, FFD_ERROR);
return flag;
}
flag = diffusion(para, var, Xi1+i, i, den, den0, BINDEX);
if(flag!=0) {
sprintf(msg, "den_step(): Could not diffuse species %d", i+1);
ffd_log(msg, FFD_ERROR);
return flag;
}
}
/****************************************************************************
| Solve the trace substances
****************************************************************************/
for(i=0; i<para->bc->nb_C; i++) {
if(para->outp->version==DEBUG) {
sprintf(msg, "den_step(): start to solve C%d", i+1);
ffd_log(msg, FFD_NORMAL);
}
den = var[C1+i];
flag = advect(para, var, Xi1, i, den0, den, BINDEX);
if(flag!=0) {
sprintf(msg, "den_step(): Could not advect trace substance %d", i+1);
ffd_log(msg, FFD_ERROR);
return flag;
}
flag = diffusion(para, var, Xi1, i, den, den0, BINDEX);
if(flag!=0) {
sprintf(msg, "den_step(): Could not diffuse trace substance %d", i+1);
ffd_log(msg, FFD_ERROR);
return flag;
}
}
return flag;
} // End of den_step( )
void ShallowWater::computeOneStep() {
Array2D<float> tempvX;
Array2D<float> tempvY;
m_n = advect(m_n);
tempvX = advect(m_vX);
tempvY = advect(m_vY);
m_vX = tempvX;
m_vY = tempvY;
updateHeight();
plus(m_n, m_g, m_h);
updateVelocities();
reflectingBoundaries();
}
void FluidField::velocityStep (float * u, float * v, float * u0, float * v0, float visc, float dt )
{
add_source (u,u0, dt );
add_source (v,v0, dt );
SWAP ( u0, u );
diffuse ( 1, u, u0, visc, dt );
SWAP ( v0, v );
diffuse ( 2, v, v0, visc, dt );
project ( u, v, u0, v0 );
SWAP ( u0, u ); SWAP ( v0, v );
advect ( 1, u, u0, u0, v0, dt );
advect ( 2, v, v0, u0, v0, dt );
project ( u, v, u0, v0 );
}
//The main fluid simulation step
void FluidSim::advance(float dt) {
float t = 0;
while(t < dt) {
float substep = cfl();
if(t + substep > dt)
substep = dt - t;
//Passively advect particles
advect_particles(substep);
//Estimate the liquid signed distance
compute_phi();
//Advance the velocity
advect(substep);
add_force(substep);
apply_viscosity(substep);
apply_projection(substep);
//Pressure projection only produces valid velocities in faces with non-zero associated face area.
//Because the advection step may interpolate from these invalid faces,
//we must extrapolate velocities from the fluid domain into these zero-area faces.
extrapolate(u, u_valid);
extrapolate(v, v_valid);
//For extrapolated velocities, replace the normal component with
//that of the object.
constrain_velocity();
t+=substep;
}
}
void MACStableFluids::step(Scalar dt)
{
float t=0;
int count=0;
while(t<dt)
{
float substep=cfl();
if(substep<0.000001)
{
std::cerr << "SUBSTEP GOING TOO LOW QUITTING\n";
return;
}
if(t+substep > dt)
substep=dt-t;
add_force(dt);
advect(dt);
diffuse(dt);
project(dt);
advect_particles(dt);
++count;
t+=substep;
}
time += dt;
}
/***************************************************************
* Solves the navier stokes equations for velocity...
* i.e. satisfies: ∂u/∂t = -(div u)u + v Lap u + f
***************************************************************/
void FGS_Fluid_Solver2DS :: velocity_step(){
// Add forces from the old grid (+f)
add_source(UX, OLD_UX);
add_source(UY, OLD_UY);
// Compute diffusion of cells' velocities based on viscosity
diffuse (SET_FOR_HORIZONTAL_COMPONENT, OLD_UX, UX, viscosity);
diffuse (SET_FOR_VERTICAL_COMPONENT, OLD_UY, UY, viscosity);
// Compute the pressure so that the divergence in U = 0
project (OLD_UX, OLD_UY, UX, UY);
advect (SET_FOR_HORIZONTAL_COMPONENT, UX, OLD_UX, OLD_UX, OLD_UY);
advect (SET_FOR_VERTICAL_COMPONENT, UY, OLD_UY, OLD_UX, OLD_UY);
project (UX, UY, OLD_UX, OLD_UY);
}
void SWSolver::advanceTimestep(){
//std::cout << "advecting eta..." << std::endl;
advect(ETA);
//std::cout << "advecting velocity_x..." << std::endl;
advect(VELOCITY_X);
//std::cout << "advecting velocity_y..." << std::endl;
advect(VELOCITY_Y);
//std::cout << "updating heights..." << std::endl;
updateHeight();
//std::cout << "updating velocities..." << std::endl;
updateVelocity();
//std::cout << "setting boundaries..." << std::endl;
setBoundary();
}
//-----------------------------------------------------------------------------
void StamFluidSolver::texture_step ( float * x, float * x0, float * u, float * v, float diff, float dt )
{
//addSource ( N, x, x0, dt );
SWAP ( x0, x );
diffuse ( 0, x, x0, diff, dt );
SWAP ( x0, x );
advect ( 0, x, x0, u, v, dt );
}
void FluidSimulator::simulateAndDraw(){
advect(0.01);
project();
draw();
}
void FluidField::densityStep (float * x, float * x0, float * u, float * v, float diff, float dt )
{
add_source ( x, x0, dt );
SWAP ( x0, x );
diffuse ( 0, x, x0, diff, dt );
SWAP ( x0, x );
advect ( 0, x, x0, u, v, dt );
}
//-----------------------------------------------------------------------------
void StamFluidSolver::dens_step ( float * x, float * x0, float * u, float * v, float diff, float dt )
{
addSource ( x, x0, dt );
SWAP ( x0, x );
diffuse ( 0, x, x0, diff, dt );
SWAP ( x0, x );
advect ( 0, x, x0, u, v, dt );
}
void advect(float dt, Field2f &u, Field2f &x0, Field2f &x1)
{
for (int y = 1; y < GRID_RES - 1; ++y)
{
for (int x = 1; x < GRID_RES - 1; ++x)
{
advect(x, y, dt, u, x0, x1);
}
}
}
void Smoke::densityStep()
{
addSource( d, dOld );
swap( dOld, d );
diffuse( 0, d, dOld, diff );
swap( dOld, d );
advect( 0, d, dOld, u, v );
}
void Fluid::dens_step(float dt)
{
add_source(sd, d, dt);
#ifdef DIFFUSE
SWAPFPTR(d0, d);
diffuse(0, d0, d, diffusion, dt);
#endif
#ifdef ADVECT
SWAPFPTR(d0, d);
advect(0, d0, d, u, v, w, dt);
#endif
}
void FluidSystem::stepDensity(Scalar dt, const DyeField &addedDensity) {
density += addedDensity * dt;
std::array<BoundarySetter, density.coords> boundarySetters;
for (std::size_t i = 0; i < density.coords; ++i) {
boundarySetters[i] = std::bind(&setContinuityBoundaries, std::placeholders::_1, dim);
}
std::swap(density, densityPrev);
diffuse(density, densityPrev, diffusionConstant, dt, dim, boundarySetters);
std::swap(density, densityPrev);
advect(density, densityPrev, velocity, dt, dim, boundarySetters);
}
void Smoke::velocityStep()
{
addSource( u, uOld );
addSource( v, vOld );
buoyancy(vOld);
addSource( v, vOld );
swap( uOld, u );
diffuse( 1, u, uOld, visc );
swap( vOld, v );
diffuse( 2, v, vOld, visc );
project( uOld, vOld );
swap( uOld, u );
swap( vOld, v );
advect( 1, u, uOld, uOld, vOld );
advect( 2, v, vOld, uOld, vOld );
project( uOld, vOld );
}
static void
redraw_handler(struct widget *widget, void *data)
{
struct smoke *smoke = data;
uint32_t time = smoke->time;
struct wl_callback *callback;
cairo_surface_t *surface;
diffuse(smoke, time / 30, smoke->b[0].u, smoke->b[1].u);
diffuse(smoke, time / 30, smoke->b[0].v, smoke->b[1].v);
project(smoke, time / 30,
smoke->b[1].u, smoke->b[1].v,
smoke->b[0].u, smoke->b[0].v);
advect(smoke, time / 30,
smoke->b[1].u, smoke->b[1].v,
smoke->b[1].u, smoke->b[0].u);
advect(smoke, time / 30,
smoke->b[1].u, smoke->b[1].v,
smoke->b[1].v, smoke->b[0].v);
project(smoke, time / 30,
smoke->b[0].u, smoke->b[0].v,
smoke->b[1].u, smoke->b[1].v);
diffuse(smoke, time / 30, smoke->b[0].d, smoke->b[1].d);
advect(smoke, time / 30,
smoke->b[0].u, smoke->b[0].v,
smoke->b[1].d, smoke->b[0].d);
surface = window_get_surface(smoke->window);
render(smoke, surface);
window_damage(smoke->window, 0, 0, smoke->width, smoke->height);
cairo_surface_destroy(surface);
callback = wl_surface_frame(window_get_wl_surface(smoke->window));
wl_callback_add_listener(callback, &listener, smoke);
wl_surface_commit(window_get_wl_surface(smoke->window));
}
void ciMsaFluidSolver::update() {
addSourceUV();
if( doVorticityConfinement )
{
vorticityConfinement(uvOld);
addSourceUV();
}
swapUV();
diffuseUV( viscocity );
project(uv, uvOld);
swapUV();
advect2d(uv, uvOld);
project(uv, uvOld);
if(doRGB)
{
addSourceRGB();
swapRGB();
if( colorDiffusion!=0. && _dt!=0. )
{
diffuseRGB(0, colorDiffusion );
swapRGB();
}
advectRGB(0, uv);
fadeRGB();
}
else
{
addSource(r, rOld);
swapR();
if( colorDiffusion!=0. && _dt!=0. )
{
diffuse(0, r, rOld, colorDiffusion );
swapRGB();
}
advect(0, r, rOld, uv);
fadeR();
}
}
void Fluid::vel_step(float dt)
{
add_source(su, u, dt);
add_source(sv, v, dt);
add_source(sw, w, dt);
add_buoyancy(dt);
vorticity_confinement(dt);
#ifdef DIFFUSE
SWAPFPTR(u0, u); SWAPFPTR(v0, v); SWAPFPTR(w0, w);
diffuse(1, u0, u, viscosity, dt);
diffuse(2, v0, v, viscosity, dt);
diffuse(3, w0, w, viscosity, dt);
project();
#endif
#ifdef ADVECT
SWAPFPTR(u0, u); SWAPFPTR(v0, v); SWAPFPTR(w0, w);
advect(1, u0, u, u0, v0, w0, dt);
advect(2, v0, v, u0, v0, w0, dt);
advect(3, w0, w, u0, v0, w0, dt);
project();
#endif
}
/***************************************************************
* Solves the navier stokes equations for density..
* i.e. satisfies: ∂d/∂t = -(div u)d + k Lap d + S
***************************************************************/
void FGS_Fluid_Solver2DS :: density_step(){
// Add density sources from the old grid (+S)
add_source(DENSITY, OLD_DENSITY);
// Compute diffusion of cells' densities into neighbours
// If diffusion > 0 then densities will diffuse (+ k Lap d)
diffuse (SET_FOR_NON_VELOCITY_COMPONENT, OLD_DENSITY, DENSITY, diffusion);
// Advect the densities based on the velocities in the cell (-(div u)d)
computing_density = true;
advect (SET_FOR_NON_VELOCITY_COMPONENT, DENSITY, OLD_DENSITY, UX, UY);
computing_density = false;
}
static void
redraw_handler(struct widget *widget, void *data)
{
struct smoke *smoke = data;
uint32_t time = widget_get_last_time(smoke->widget);
cairo_surface_t *surface;
diffuse(smoke, time / 30, smoke->b[0].u, smoke->b[1].u);
diffuse(smoke, time / 30, smoke->b[0].v, smoke->b[1].v);
project(smoke, time / 30,
smoke->b[1].u, smoke->b[1].v,
smoke->b[0].u, smoke->b[0].v);
advect(smoke, time / 30,
smoke->b[1].u, smoke->b[1].v,
smoke->b[1].u, smoke->b[0].u);
advect(smoke, time / 30,
smoke->b[1].u, smoke->b[1].v,
smoke->b[1].v, smoke->b[0].v);
project(smoke, time / 30,
smoke->b[0].u, smoke->b[0].v,
smoke->b[1].u, smoke->b[1].v);
diffuse(smoke, time / 30, smoke->b[0].d, smoke->b[1].d);
advect(smoke, time / 30,
smoke->b[0].u, smoke->b[0].v,
smoke->b[1].d, smoke->b[0].d);
surface = window_get_surface(smoke->window);
render(smoke, surface);
window_damage(smoke->window, 0, 0, smoke->width, smoke->height);
cairo_surface_destroy(surface);
widget_schedule_redraw(smoke->widget);
}