diff options
author | Ian Jauslin <ian.jauslin@rutgers.edu> | 2023-04-25 17:51:14 -0400 |
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committer | Ian Jauslin <ian.jauslin@rutgers.edu> | 2023-04-25 18:08:45 -0400 |
commit | d8380602656b54649c46bac93876b814b4d8eba7 (patch) | |
tree | 77ab07a983cd8683d095576dce40ee19b6f220da /src/navier-stokes.c | |
parent | 519bb7272661ae4fb81a9c4851133cd8e7da1805 (diff) |
Remove terms with kx=0 and ky<=0
Diffstat (limited to 'src/navier-stokes.c')
-rw-r--r-- | src/navier-stokes.c | 52 |
1 files changed, 32 insertions, 20 deletions
diff --git a/src/navier-stokes.c b/src/navier-stokes.c index 153631b..51d198c 100644 --- a/src/navier-stokes.c +++ b/src/navier-stokes.c @@ -241,12 +241,12 @@ int ns_init_tmps( unsigned int nthreads ){ // velocity field - *u=calloc(sizeof(_Complex double),(K1+1)*(2*K2+1)); + *u=calloc(sizeof(_Complex double),K1*(2*K2+1)+K2); // allocate tmp vectors for computation - *tmp1=calloc(sizeof(_Complex double),(K1+1)*(2*K2+1)); - *tmp2=calloc(sizeof(_Complex double),(K1+1)*(2*K2+1)); - *tmp3=calloc(sizeof(_Complex double),(K1+1)*(2*K2+1)); + *tmp1=calloc(sizeof(_Complex double),K1*(2*K2+1)+K2); + *tmp2=calloc(sizeof(_Complex double),K1*(2*K2+1)+K2); + *tmp3=calloc(sizeof(_Complex double),K1*(2*K2+1)+K2); // init threads fftw_init_threads(); @@ -303,7 +303,7 @@ int copy_u( ){ int i; - for(i=0;i<(K1+1)*(2*K2+1);i++){ + for(i=0;i<K1*(2*K2+1)+K2;i++){ u[i]=u0[i]; } @@ -335,14 +335,14 @@ int ns_step( ns_rhs(tmp1, u, K1, K2, N1, N2, nu, L, g, fft1, fft2, ifft, irreversible); // add to output for(kx=0;kx<=K1;kx++){ - for(ky=-K2;ky<=K2;ky++){ + for(ky=(kx>0 ? -K2 : 1);ky<=K2;ky++){ tmp3[klookup_sym(kx,ky,K2)]=u[klookup_sym(kx,ky,K2)]+delta/6*tmp1[klookup_sym(kx,ky,K2)]; } } // u+h*k1/2 for(kx=0;kx<=K1;kx++){ - for(ky=-K2;ky<=K2;ky++){ + for(ky=(kx>0 ? -K2 : 1);ky<=K2;ky++){ tmp2[klookup_sym(kx,ky,K2)]=u[klookup_sym(kx,ky,K2)]+delta/2*tmp1[klookup_sym(kx,ky,K2)]; } } @@ -350,14 +350,14 @@ int ns_step( ns_rhs(tmp1, tmp2, K1, K2, N1, N2, nu, L, g, fft1, fft2, ifft, irreversible); // add to output for(kx=0;kx<=K1;kx++){ - for(ky=-K2;ky<=K2;ky++){ + for(ky=(kx>0 ? -K2 : 1);ky<=K2;ky++){ tmp3[klookup_sym(kx,ky,K2)]+=delta/3*tmp1[klookup_sym(kx,ky,K2)]; } } // u+h*k2/2 for(kx=0;kx<=K1;kx++){ - for(ky=-K2;ky<=K2;ky++){ + for(ky=(kx>0 ? -K2 : 1);ky<=K2;ky++){ tmp2[klookup_sym(kx,ky,K2)]=u[klookup_sym(kx,ky,K2)]+delta/2*tmp1[klookup_sym(kx,ky,K2)]; } } @@ -365,14 +365,14 @@ int ns_step( ns_rhs(tmp1, tmp2, K1, K2, N1, N2, nu, L, g, fft1, fft2, ifft, irreversible); // add to output for(kx=0;kx<=K1;kx++){ - for(ky=-K2;ky<=K2;ky++){ + for(ky=(kx>0 ? -K2 : 1);ky<=K2;ky++){ tmp3[klookup_sym(kx,ky,K2)]+=delta/3*tmp1[klookup_sym(kx,ky,K2)]; } } // u+h*k3 for(kx=0;kx<=K1;kx++){ - for(ky=-K2;ky<=K2;ky++){ + for(ky=(kx>0 ? -K2 : 1);ky<=K2;ky++){ tmp2[klookup_sym(kx,ky,K2)]=u[klookup_sym(kx,ky,K2)]+delta*tmp1[klookup_sym(kx,ky,K2)]; } } @@ -380,7 +380,7 @@ int ns_step( ns_rhs(tmp1, tmp2, K1, K2, N1, N2, nu, L, g, fft1, fft2, ifft, irreversible); // add to output for(kx=0;kx<=K1;kx++){ - for(ky=-K2;ky<=K2;ky++){ + for(ky=(kx>0 ? -K2 : 1);ky<=K2;ky++){ u[klookup_sym(kx,ky,K2)]=tmp3[klookup_sym(kx,ky,K2)]+delta/6*tmp1[klookup_sym(kx,ky,K2)]; } } @@ -417,14 +417,12 @@ int ns_rhs( alpha=compute_alpha(u,K1,K2,g,L); } - for(i=0; i<(K1+1)*(2*K2+1); i++){ + for(i=0; i<K1*(2*K2+1)+K2; i++){ out[i]=0; } for(kx=0;kx<=K1;kx++){ - for(ky=-K2;ky<=K2;ky++){ - if(kx!=0 || ky!=0){ - out[klookup_sym(kx,ky,K2)]=-4*M_PI*M_PI/L/L*alpha*(kx*kx+ky*ky)*u[klookup_sym(kx,ky,K2)]+g[klookup_sym(kx,ky,K2)]+4*M_PI*M_PI/L/L/sqrt(kx*kx+ky*ky)*ifft.fft[klookup(kx,ky,N1,N2)]; - } + for(ky=(kx>0 ? -K2 : 1);ky<=K2;ky++){ + out[klookup_sym(kx,ky,K2)]=-4*M_PI*M_PI/L/L*alpha*(kx*kx+ky*ky)*u[klookup_sym(kx,ky,K2)]+g[klookup_sym(kx,ky,K2)]+4*M_PI*M_PI/L/L/sqrt(kx*kx+ky*ky)*ifft.fft[klookup(kx,ky,N1,N2)]; } } @@ -610,7 +608,7 @@ int klookup( return (kx>=0 ? kx : S1+kx)*S2 + (ky>=0 ? ky : S2+ky); } -// get index for kx,ky in array of size K1,K2 in which only the terms with kx>=0 are stored +// get index for kx,ky in array of size K1,K2 in which only the terms with kx>=0 and if kx=0, ky>0 are stored int klookup_sym( int kx, int ky, @@ -620,7 +618,14 @@ int klookup_sym( fprintf(stderr, "bug!: attempting to access a symmetrized vector at kx<0\n Contact Ian at ian.jauslin@rutgers.edu!\n"); exit(-1); } - return kx*(2*K2+1) + (ky>=0 ? ky : (2*K2+1)+ky); + if (kx==0) { + if (ky<=0){ + fprintf(stderr, "bug!: attempting to access a symmetrized vector at kx=0 and ky<=0\n Contact Ian at ian.jauslin@rutgers.edu!\n"); + exit(-1); + } + return ky-1; + } + return K2+(kx-1)*(2*K2+1) + (ky>=0 ? ky : (2*K2+1)+ky); } // get u_{kx,ky} from a vector u in which only the values for kx>=0 are stored, assuming u_{-k}=u_k^* @@ -630,5 +635,12 @@ _Complex double getval_sym( int ky, int K2 ){ - return (kx>=0 ? u[klookup_sym(kx,ky,K2)] : conj(u[klookup_sym(-kx,-ky,K2)])); + if(kx>0 || (kx==0 && ky>0)){ + return u[klookup_sym(kx,ky,K2)]; + } + else if(kx==0 && ky==0){ + return 0; + } else { + return conj(u[klookup_sym(-kx,-ky,K2)]); + } } |