wall_model_kernel.h

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#ifndef __COMMON_WALL_MODEL_KERNEL_H__
#define __COMMON_WALL_MODEL_KERNEL_H__
/*
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     contributors may be used to endorse or promote products derived
     from this software without specific prior written permission.
 
 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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 BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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*/
 
#include <cmath>
#include <algorithm>
template<typename T>
__global__ void wall_model_compute_mag_field(const T * __restrict__ tau_x_d,
                                             const T * __restrict__ tau_y_d,
                                             const T * __restrict__ tau_z_d,
                                             T * __restrict__ tau_field_d,
                                             const int * __restrict__ msk_d,
                                             const int m) {
    const int idx = blockIdx.x * blockDim.x + threadIdx.x;
    const int str = blockDim.x * gridDim.x;
 
    for (int i = idx; i < m; i += str) {
        // Compute the magnitude of the shear stress vector
        T magtau = sqrt(tau_x_d[i] * tau_x_d[i] +
        tau_y_d[i] * tau_y_d[i] +
        tau_z_d[i] * tau_z_d[i]);
 
        // Store the result in the tau_field array at the masked index
        tau_field_d[msk_d[i]-1] = magtau;
    }
} 
#endif // __COMMON_WALL_model_KERNEL_H__