makebdf_kernel.h

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#ifndef __COMMON_MAKEBDF_KERNEL__
#define __COMMON_MAKEBDF_KERNEL__
 
template< typename T >
__global__ void makebdf_kernel(const T * __restrict__ ulag1,
                               const T * __restrict__ ulag2,
                               const T * __restrict__ vlag1,
                               const T * __restrict__ vlag2,
                               const T * __restrict__ wlag1,
                               const T * __restrict__ wlag2,
                               T * __restrict__ bfx,
                               T * __restrict__ bfy,
                               T * __restrict__ bfz,
                               const T * __restrict__ u,
                               const T * __restrict__ v,
                               const T * __restrict__ w,
                               const T * __restrict__ B,
                               const T * __restrict__ Blag,
                               const T * __restrict__ Blaglag,
                               const T rho,
                               const T dt,
                               const T bd2,
                               const T bd3,
                               const T bd4,
                               const int nbd,
                               const int n) {
 
  const int idx = blockIdx.x * blockDim.x + threadIdx.x;
  const int str = blockDim.x * gridDim.x;
 
  for (int i = idx; i < n; i += str) {
    T tb1_val = u[i] * B[i] * bd2;
    T tb2_val = v[i] * B[i] * bd2;
    T tb3_val = w[i] * B[i] * bd2;
 
    T ta1_val = ulag1[i] * Blag[i] * bd3;
    T ta2_val = vlag1[i] * Blag[i] * bd3;
    T ta3_val = wlag1[i] * Blag[i] * bd3;
 
    tb1_val += ta1_val;
    tb2_val += ta2_val;
    tb3_val += ta3_val;
 
    if (nbd == 3) {
      tb1_val += ulag2[i] * Blaglag[i] * bd4;
      tb2_val += vlag2[i] * Blaglag[i] * bd4;
      tb3_val += wlag2[i] * Blaglag[i] * bd4;
    }
    
    bfx[i] = bfx[i] + tb1_val * (rho / dt);
    bfy[i] = bfy[i] + tb2_val * (rho / dt);
    bfz[i] = bfz[i] + tb3_val * (rho / dt);
  }
 
}
 
template< typename T >
__global__ void scalar_makebdf_kernel(const T * __restrict__ s_lag,
                                      const T * __restrict__ s_laglag,
                                      T * __restrict__ fs,
                                      const T * __restrict__ s,
                                      const T * __restrict__ B,
                                      const T rho,
                                      const T dt,
                                      const T bd2,
                                      const T bd3,
                                      const T bd4,
                                      const int nbd,
                                      const int n) {
 
  const int idx = blockIdx.x * blockDim.x + threadIdx.x;
  const int str = blockDim.x * gridDim.x;
 
  for (int i = idx; i < n; i += str) {
    T tb1_val = s[i] * B[i] * bd2;
 
    T ta1_val = s_lag[i] * B[i] * bd3;
 
    tb1_val += ta1_val;
 
    if (nbd == 3) {
      tb1_val += s_laglag[i] * B[i] * bd4;
    }
    
    // todo: probably not just rho here
    fs[i] = fs[i] + tb1_val * (rho / dt);
  }
 
}
 
#endif //__COMMON_MAKEBDF_KERNEL__