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Enforce reality directly in RK

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This commit is contained in:
Ian Jauslin 2023-04-06 11:28:18 -04:00
parent 1616b6bbae
commit 184b46f756
1 changed files with 9 additions and 0 deletions
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9
src/navier-stokes.c
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@ -348,6 +348,13 @@ int ns_step(
} }
} }
// enforce u(-k)=u(k)^*
for(kx=-K1;kx<=K1;kx++){
for(ky=-K2;ky<=K2;ky++){
u[klookup(kx,ky,2*K1+1,2*K2+1)]=(u[klookup(kx,ky,2*K1+1,2*K2+1)]+conj(u[klookup(-kx,-ky,2*K1+1,2*K2+1)]))/2;
}
}
return(0); return(0);
} }
@ -470,12 +477,14 @@ int ns_T(
// inverse fft // inverse fft
fftw_execute(ifft.fft_plan); fftw_execute(ifft.fft_plan);
/*
// enforce T(u,-k)=T(u,k)^* // enforce T(u,-k)=T(u,k)^*
for(kx=-K1;kx<=K1;kx++){ for(kx=-K1;kx<=K1;kx++){
for(ky=-K2;ky<=K2;ky++){ for(ky=-K2;ky<=K2;ky++){
ifft.fft[klookup(kx,ky,N1,N2)]=(ifft.fft[klookup(kx,ky,N1,N2)]+conj(ifft.fft[klookup(-kx,-ky,N1,N2)]))/2; ifft.fft[klookup(kx,ky,N1,N2)]=(ifft.fft[klookup(kx,ky,N1,N2)]+conj(ifft.fft[klookup(-kx,-ky,N1,N2)]))/2;
} }
} }
*/
return(0); return(0);
} }