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Heat advection, currently doesn't obey the whole conservation of energy law

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Simon Robertshaw 2011-06-10 17:34:47 +01:00
parent 33b3355192
commit 7ae52660f5
1 changed files with 24 additions and 1 deletions
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25
src/air.c
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@ -44,7 +44,7 @@ void make_kernel(void) //used for velocity
void update_airh(void)
{
int x, y, i, j;
float dh, dp, f, tx, ty;
float dh, dx, dy, f, tx, ty;
for (i=0; i<YRES/CELL; i++) //reduces pressure/velocity on the edges every frame
{
hv[i][0] = 295.15f;
@ -62,31 +62,54 @@ void update_airh(void)
hv[YRES/CELL-1][i] = 295.15f;
}
for (y=0; y<YRES/CELL; y++) //update velocity and pressure
{
for (x=0; x<XRES/CELL; x++)
{
dh = 0.0f;
dx = 0.0f;
dy = 0.0f;
for (j=-1; j<2; j++)
{
for (i=-1; i<2; i++)
{
if (y+j>0 && y+j<YRES/CELL-2 &&
x+i>0 && x+i<XRES/CELL-2 &&
bmap[y+j][x+i]!=WL_WALL &&
bmap[y+j][x+i]!=WL_WALLELEC &&
bmap[y+j][x+i]!=WL_GRAV &&
(bmap[y+j][x+i]!=WL_EWALL || emap[y+j][x+i]))
{
f = kernel[i+1+(j+1)*3];
dh += hv[y+j][x+i]*f;
dx += vx[y+j][x+i]*f;
dy += vy[y+j][x+i]*f;
}
else
{
f = kernel[i+1+(j+1)*3];
dh += hv[y][x]*f;
dx += vx[y][x]*f;
dy += vy[y][x]*f;
}
}
}
tx = x - dx*0.7f;
ty = y - dy*0.7f;
i = (int)tx;
j = (int)ty;
tx -= i;
ty -= j;
if (i>=2 && i<XRES/CELL-3 && j>=2 && j<YRES/CELL-3)
{
dh *= 1.0f - AIR_VADV;
dh += AIR_VADV*(1.0f-tx)*(1.0f-ty)*hv[j][i];
dh += AIR_VADV*tx*(1.0f-ty)*hv[j][i+1];
dh += AIR_VADV*(1.0f-tx)*ty*hv[j+1][i];
dh += AIR_VADV*tx*ty*hv[j+1][i+1];
}
ohv[y][x] = dh;
}
}
memcpy(hv, ohv, sizeof(hv));
}