void MacCormackClamp(FlagGrid& flags, MACGrid& vel, Grid<T>& dst, Grid<T>& orig, Grid<T>& fwd, Real dt)
{
if (flags.isObstacle(i,j,k))
return;
if ( isNotFluid(flags,i,j,k) ) {
dst(i,j,k) = fwd(i,j,k);
return;
}
T dval = dst(i,j,k);
Vec3i upperClamp = flags.getSize() - 1;
// lookup forward/backward
Vec3i posFwd = toVec3i( Vec3(i,j,k) - vel.getCentered(i,j,k) * dt );
Vec3i posBwd = toVec3i( Vec3(i,j,k) + vel.getCentered(i,j,k) * dt );
dval = doClampComponent<T>(upperClamp, orig, dval, posFwd );
// test if lookups point out of grid or into obstacle
if (posFwd.x < 0 || posFwd.y < 0 || posFwd.z < 0 ||
posBwd.x < 0 || posBwd.y < 0 || posBwd.z < 0 ||
posFwd.x > upperClamp.x || posFwd.y > upperClamp.y || ((posFwd.z > upperClamp.z)&&flags.is3D()) ||
posBwd.x > upperClamp.x || posBwd.y > upperClamp.y || ((posBwd.z > upperClamp.z)&&flags.is3D()) ||
flags.isObstacle(posFwd) || flags.isObstacle(posBwd) )
{
dval = fwd(i,j,k);
}
dst(i,j,k) = dval;
}
void SemiLagrangeMAC(FlagGrid& flags, MACGrid& vel, MACGrid& dst, MACGrid& src, Real dt)
{
if (flags.isObstacle(i,j,k)) {
dst(i,j,k) = 0;
return;
}
// std::cout << " Don't worry, I MADE IT till here " << std::endl ;
if ( isNotFluidMAC(flags,i,j,k) ) {
dst(i,j,k) = src(i,j,k);
return;
}
// std::cout << " Don't worry, I REACHED till here " << std::endl ;
// get currect velocity at MAC position
// no need to shift xpos etc. as lookup field is also shifted
Vec3 xpos = Vec3(i+0.5f,j+0.5f,k+0.5f) - vel.getAtMACX(i,j,k) * dt;
Real vx = src.getInterpolatedComponent<0>(xpos);
Vec3 ypos = Vec3(i+0.5f,j+0.5f,k+0.5f) - vel.getAtMACY(i,j,k) * dt;
Real vy = src.getInterpolatedComponent<1>(ypos);
Vec3 zpos = Vec3(i+0.5f,j+0.5f,k+0.5f) - vel.getAtMACZ(i,j,k) * dt;
Real vz = src.getInterpolatedComponent<2>(zpos);
// std::cout << " Don't worry, I CAN till here " << std::endl ;
dst(i,j,k) = Vec3(vx,vy,vz);
// std::cout << " Don't worry, I COULD till here " << std::endl ;
}
//! set no-stick wall boundary condition between ob/fl and ob/ob cells
KERNEL void KnSetWallBcs(FlagGrid& flags, MACGrid& vel, Vector3D<bool> lo, Vector3D<bool> up, bool admm) {
bool curFluid = flags.isFluid(i,j,k);
bool curObstacle = flags.isObstacle(i,j,k);
if (!curFluid && !curObstacle) return;
// MLE 2014-07-04
// if not admm, leave it as in orig
// if openBound, don't correct anything (solid is as empty)
// if admm, correct if vel is pointing outwards
// if "inner" obstacle vel
if(i>0 && curObstacle && !flags.isFluid(i-1,j,k)) vel(i,j,k).x = 0;
if(j>0 && curObstacle && !flags.isFluid(i,j-1,k)) vel(i,j,k).y = 0;
// check lo.x
if(!lo.x && i>0 && curFluid && flags.isObstacle(i-1,j,k) && ((admm&&vel(i,j,k).x<0)||!admm)) vel(i,j,k).x = 0;
// check up.x
if(!up.x && i>0 && curObstacle && flags.isFluid(i-1,j,k) && ((admm&&vel(i,j,k).x>0)||!admm)) vel(i,j,k).x = 0;
// check lo.y
if(!lo.y && j>0 && curFluid && flags.isObstacle(i,j-1,k) && ((admm&&vel(i,j,k).y<0)||!admm)) vel(i,j,k).y = 0;
// check up.y
if(!up.y && j>0 && curObstacle && flags.isFluid(i,j-1,k) && ((admm&&vel(i,j,k).y>0)||!admm)) vel(i,j,k).y = 0;
// check lo.z
if(!lo.z && k>0 && curFluid && flags.isObstacle(i,j,k-1) && ((admm&&vel(i,j,k).z<0)||!admm)) vel(i,j,k).z = 0;
// check up.z
if(!up.z && k>0 && curObstacle && flags.isFluid(i,j,k-1) && ((admm&&vel(i,j,k).z>0)||!admm)) vel(i,j,k).z = 0;
/* MLE consider later
if (curFluid) {
if ((i>0 && flags.isStick(i-1,j,k)) || (i<flags.getSizeX()-1 && flags.isStick(i+1,j,k)))
vel(i,j,k).y = vel(i,j,k).z = 0;
if ((j>0 && flags.isStick(i,j-1,k)) || (j<flags.getSizeY()-1 && flags.isStick(i,j+1,k)))
vel(i,j,k).x = vel(i,j,k).z = 0;
if (vel.is3D() && ((k>0 && flags.isStick(i,j,k-1)) || (k<flags.getSizeZ()-1 && flags.isStick(i,j,k+1))))
vel(i,j,k).x = vel(i,j,k).y = 0;
}
*/
}
void CorrectVelocity(FlagGrid& flags, MACGrid& vel, Grid<Real>& pressure)
{
// correct all faces between fluid-fluid and fluid-empty cells
// skip everything with obstacles...
if (flags.isObstacle(i,j,k))
return;
// skip faces between two empty cells
const bool curEmpty = flags.isEmpty(i,j,k);
const Real p = pressure(i,j,k);
if (!curEmpty || !flags.isEmpty(i-1,j,k)) vel(i,j,k).x -= (p - pressure(i-1,j,k));
if (!curEmpty || !flags.isEmpty(i,j-1,k)) vel(i,j,k).y -= (p - pressure(i,j-1,k));
if (!curEmpty || !flags.isEmpty(i,j,k-1)) vel(i,j,k).z -= (p - pressure(i,j,k-1));
}
void CorrectVelGhostFluid (FlagGrid& flags, MACGrid& vel, Grid<Real>& pressure) //, Grid<Real>& phi)
{
bool curFluid = flags.isFluid(i,j,k);
if (!curFluid && !flags.isEmpty(i,j,k))
return;
const Real curPress = pressure(i,j,k);
//const Real curPhi = phi(i,j,k);
// TODO - include ghost fluid factor NT_DEBUG
// in contrast to old implementation:
// make sure to add gradient for all fluid-empty or fluid-fluid combinations
// of neighbors...
if (!flags.isObstacle(i-1,j,k) && (curFluid || flags.isFluid(i-1,j,k)))
vel(i,j,k).x -= curPress - pressure(i-1,j,k);
if (!flags.isObstacle(i,j-1,k) && (curFluid || flags.isFluid(i,j-1,k)))
vel(i,j,k).y -= curPress - pressure(i,j-1,k);
if (flags.is3D() && (!flags.isObstacle(i,j,k-1) && (curFluid || flags.isFluid(i,j,k-1))))
vel(i,j,k).z -= curPress - pressure(i,j,k-1);
}
void SemiLagrange (FlagGrid& flags, MACGrid& vel, Grid<T>& dst, Grid<T>& src, Real dt, bool isLevelset)
{
if (flags.isObstacle(i,j,k)) {
dst(i,j,k) = 0;
return;
}
if (!isLevelset && isNotFluid(flags,i,j,k) ) {
dst(i,j,k) = src(i,j,k);
return;
}
// SL traceback
Vec3 pos = Vec3(i+0.5f,j+0.5f,k+0.5f) - vel.getCentered(i,j,k) * dt;
dst(i,j,k) = src.getInterpolated(pos);
}
void MacCormackClampMAC (FlagGrid& flags, MACGrid& vel, MACGrid& dst, MACGrid& orig, MACGrid& fwd, Real dt)
{
if (flags.isObstacle(i,j,k))
return;
if ( isNotFluidMAC(flags,i,j,k) ) {
dst(i,j,k) = fwd(i,j,k);
return;
}
Vec3 pos(i,j,k);
Vec3 dval = dst(i,j,k);
Vec3i upperClamp = flags.getSize() - 1;
// get total fwd lookup
Vec3i posFwd = toVec3i( Vec3(i,j,k) - vel.getCentered(i,j,k) * dt );
Vec3i posBwd = toVec3i( Vec3(i,j,k) + vel.getCentered(i,j,k) * dt );
// clamp individual components
dval.x = doClampComponentMAC<0>(upperClamp, orig, dval.x, toVec3i( pos - vel.getAtMACX(i,j,k) * dt) );
dval.y = doClampComponentMAC<1>(upperClamp, orig, dval.y, toVec3i( pos - vel.getAtMACY(i,j,k) * dt) );
dval.z = doClampComponentMAC<2>(upperClamp, orig, dval.z, toVec3i( pos - vel.getAtMACZ(i,j,k) * dt) );
// test if lookups point out of grid or into obstacle
if (posFwd.x < 0 || posFwd.y < 0 || posFwd.z < 0 ||
posBwd.x < 0 || posBwd.y < 0 || posBwd.z < 0 ||
posFwd.x > upperClamp.x || posFwd.y > upperClamp.y || ((posFwd.z > upperClamp.z)&&flags.is3D()) ||
posBwd.x > upperClamp.x || posBwd.y > upperClamp.y || ((posBwd.z > upperClamp.z)&&flags.is3D())
//|| flags.isObstacle(posFwd) || flags.isObstacle(posBwd) // note - this unfortunately introduces asymmetry... TODO update
)
{
dval = fwd(i,j,k);
}
// writeback
dst(i,j,k) = dval;
}
void TurbulenceParticleSystem::deleteInObstacle(FlagGrid& flags) {
for (int i=0; i<size(); i++)
if (flags.isObstacle(mData[i].pos))
mData[i].flag |= PDELETE;
compress();
}