prs_res_kernel.h

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#ifndef __FLUID_PRS_RES_KERNEL__
#define __FLUID_PRS_RES_KERNEL__
 
template< typename T >
__global__ void prs_res_part1_kernel(T * __restrict__ ta1,
                                     T * __restrict__ ta2,
                                     T * __restrict__ ta3,
                                     const T * __restrict__ wa1,
                                     const T * __restrict__ wa2,
                                     const T * __restrict__ wa3,
                                     const T * __restrict__ f_u,
                                     const T * __restrict__ f_v,
                                     const T * __restrict__ f_w,
                                     const T * __restrict__ B,
                                     T * __restrict__ h1,
                                     const T mu,
                                     const T rho,
                                     const int n) {
  
  const int idx = blockIdx.x * blockDim.x + threadIdx.x;
  const int str = blockDim.x * gridDim.x;
  const T inv_rho = 1.0 / rho;
  
  for (int i = idx; i < n; i += str) {
    h1[i] = inv_rho;
    ta1[i] = (f_u[i] / rho) - ((wa1[i] * (mu / rho)) * B[i]);
    ta2[i] = (f_v[i] / rho) - ((wa2[i] * (mu / rho)) * B[i]);
    ta3[i] = (f_w[i] / rho) - ((wa3[i] * (mu / rho)) * B[i]);
  }
 
}
 
 
template< typename T >
__global__ void prs_res_part2_kernel(T * __restrict__ p_res,
                                     const T * __restrict__ wa1,
                                     const T * __restrict__ wa2,
                                     const T * __restrict__ wa3,
                                     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) {
    p_res[i] = (-p_res[i]) + (wa1[i] + wa2[i] + wa3[i]);
  }
}
 
template< typename T >
__global__ void prs_res_part3_kernel(T * __restrict__ p_res,
                                     const T * __restrict__ ta1,
                                     const T * __restrict__ ta2,
                                     const T * __restrict__ ta3,
                                     const T dtbd,
                                     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) {
    p_res[i] = p_res[i] - (dtbd * (ta1[i] + ta2[i] + ta3[i]));
  }
}
 
#endif // __FLUID_PRS_RES_KERNEL__