Neko  0.9.0
A portable framework for high-order spectral element flow simulations
sigma_nut_kernel.h
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1 #ifndef __COMMON_SIGMA_NUT_KERNEL_H__
2 #define __COMMON_SIGMA_NUT_KERNEL_H__
3 /*
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36 
40 #include <cmath>
41 #include <algorithm>
42 template< typename T>
43 __global__ void sigma_nut_compute(T * __restrict__ g11,
44  T * __restrict__ g12,
45  T * __restrict__ g13,
46  T * __restrict__ g21,
47  T * __restrict__ g22,
48  T * __restrict__ g23,
49  T * __restrict__ g31,
50  T * __restrict__ g32,
51  T * __restrict__ g33,
52  T * __restrict__ delta,
53  T * __restrict__ nut,
54  T * __restrict__ mult,
55  const T c,
56  const T eps,
57  const int n){
58 
59  const int idx = blockIdx.x * blockDim.x + threadIdx.x;
60  const int str = blockDim.x * gridDim.x;
61 
62  for (int i = idx; i < n; i += str) {
63  T sigG11, sigG12, sigG13, sigG22, sigG23, sigG33;
64  T sigma1, sigma2, sigma3;
65  T Invariant1, Invariant2, Invariant3;
66  T alpha1, alpha2, alpha3;
67  T Dsigma;
68  T pi_3;
69  T tmp1;
70 
71  pi_3 = 4.0/3.0*atan(1.0);
72 
73  g11[i] = g11[i] * mult[i];
74  g12[i] = g12[i] * mult[i];
75  g13[i] = g13[i] * mult[i];
76  g21[i] = g21[i] * mult[i];
77  g22[i] = g22[i] * mult[i];
78  g23[i] = g23[i] * mult[i];
79  g31[i] = g31[i] * mult[i];
80  g32[i] = g32[i] * mult[i];
81  g33[i] = g33[i] * mult[i];
82 
83  sigG11 = g11[i]*g11[i] + g21[i]*g21[i] + g31[i]*g31[i];
84  sigG22 = g12[i]*g12[i] + g22[i]*g22[i] + g32[i]*g32[i];
85  sigG33 = g13[i]*g13[i] + g23[i]*g23[i] + g33[i]*g33[i];
86  sigG12 = g11[i]*g12[i] + \
87  g21[i]*g22[i] + \
88  g31[i]*g32[i];
89  sigG13 = g11[i]*g13[i] + \
90  g21[i]*g23[i] + \
91  g31[i]*g33[i];
92  sigG23 = g12[i]*g13[i] + \
93  g22[i]*g23[i] + \
94  g32[i]*g33[i];
95 
96  if (abs(sigG11) < eps) {
97  sigG11 = 0.0;
98  }
99  if (abs(sigG12) < eps) {
100  sigG12 = 0.0;
101  }
102  if (abs(sigG13) < eps) {
103  sigG13 = 0.0;
104  }
105  if (abs(sigG22) < eps) {
106  sigG22 = 0.0;
107  }
108  if (abs(sigG23) < eps) {
109  sigG23 = 0.0;
110  }
111  if (abs(sigG33) < eps) {
112  sigG33 = 0.0;
113  }
114 
115  if (abs(sigG12*sigG12 + \
116  sigG13*sigG13 + sigG23*sigG23) < eps) {
117  sigma1 = sqrt(max(max(max(sigG11, sigG22), sigG33), 0.0));
118  sigma3 = sqrt(max(min(min(sigG11, sigG22), sigG33), 0.0));
119  Invariant1 = sigG11 + sigG22 + sigG33;
120  sigma2 = sqrt(abs(Invariant1 - sigma1*sigma1 - sigma3*sigma3));
121  } else {
122  Invariant1 = sigG11 + sigG22 + sigG33;
123  Invariant2 = sigG11*sigG22 + sigG11*sigG33 + sigG22*sigG33 - \
124  (sigG12*sigG12 + sigG13*sigG13 + sigG23*sigG23);
125  Invariant3 = sigG11*sigG22*sigG33 + \
126  2.0*sigG12*sigG13*sigG23 - \
127  (sigG11*sigG23*sigG23 + sigG22*sigG13*sigG13 + \
128  sigG33*sigG12*sigG12);
129 
130  Invariant1 = max(Invariant1, 0.0);
131  Invariant2 = max(Invariant2, 0.0);
132  Invariant3 = max(Invariant3, 0.0);
133 
134  alpha1 = Invariant1*Invariant1/9.0 - Invariant2/3.0;
135 
136  alpha1 = max(alpha1, 0.0);
137 
138  alpha2 = Invariant1*Invariant1*Invariant1/27.0 - \
139  Invariant1*Invariant2/6.0 + Invariant3/2.0;
140 
141  tmp1 = alpha2/sqrt(alpha1 * alpha1 * alpha1);
142 
143  if (tmp1 <= -1.0) {
144  sigma1 = sqrt(max(Invariant1/3.0 + sqrt(alpha1), 0.0));
145  sigma2 = sigma1;
146  sigma3 = sqrt(Invariant1/3.0 - 2.0*sqrt(alpha1));
147 
148  } else if (tmp1 >= 1.0) {
149  sigma1 = sqrt(max(Invariant1/3.0 + 2.0*sqrt(alpha1), 0.0));
150  sigma2 = sqrt(Invariant1/3.0 - sqrt(alpha1));
151  sigma3 = sigma2;
152 
153  } else {
154  alpha3 = acos(tmp1)/3.0;
155 
156  if (abs(Invariant3) < eps) {
157  sigma1 = sqrt(max(Invariant1/3.0 + \
158  2.0*sqrt(alpha1)*cos(alpha3), 0.0));
159  sigma2 = sqrt(abs(Invariant1 - sigma1*sigma1));
160  sigma3 = 0.0;
161  } else {
162  sigma1 = sqrt(max(Invariant1/3.0 + \
163  2.0*sqrt(alpha1)*cos(alpha3), 0.0));
164  sigma2 = sqrt(Invariant1/3.0 - \
165  2.0*sqrt(alpha1)*cos(pi_3 + alpha3));
166  sigma3 = sqrt(abs(Invariant1 - \
167  sigma1*sigma1-sigma2*sigma2));
168  }
169  }
170  }
171 
172  if (sigma1 > 0.0) {
173  Dsigma = sigma3*(sigma1 - sigma2)*(sigma2 - sigma3)/(sigma1*sigma1);
174  } else {
175  Dsigma = 0.0;
176  }
177 
178  Dsigma = max(Dsigma, 0.0);
179 
180  nut[i] = (c*delta[i])*(c*delta[i]) * Dsigma;
181  }
182 }
183 #endif // __COMMON_SIGMA_NUT_KERNEL_H__
i
const int i
Definition: ax_helm_full_kernel.h:95
sigma_nut_compute
__global__ void sigma_nut_compute(T *__restrict__ g11, T *__restrict__ g12, T *__restrict__ g13, T *__restrict__ g21, T *__restrict__ g22, T *__restrict__ g23, T *__restrict__ g31, T *__restrict__ g32, T *__restrict__ g33, T *__restrict__ delta, T *__restrict__ nut, T *__restrict__ mult, const T c, const T eps, const int n)
Definition: sigma_nut_kernel.h:43
g23
__global__ void const T *__restrict__ const T *__restrict__ const T *__restrict__ const T *__restrict__ const T *__restrict__ const T *__restrict__ const T *__restrict__ const T *__restrict__ const T *__restrict__ const T *__restrict__ const T *__restrict__ g23
Definition: ax_helm_kernel.h:161
g22
__global__ void const T *__restrict__ const T *__restrict__ const T *__restrict__ const T *__restrict__ const T *__restrict__ const T *__restrict__ const T *__restrict__ g22
Definition: ax_helm_kernel.h:157
g13
__global__ void const T *__restrict__ const T *__restrict__ const T *__restrict__ const T *__restrict__ const T *__restrict__ const T *__restrict__ const T *__restrict__ const T *__restrict__ const T *__restrict__ const T *__restrict__ g13
Definition: ax_helm_kernel.h:160
g12
__global__ void const T *__restrict__ const T *__restrict__ const T *__restrict__ const T *__restrict__ const T *__restrict__ const T *__restrict__ const T *__restrict__ const T *__restrict__ const T *__restrict__ g12
Definition: ax_helm_kernel.h:159
g33
__global__ void const T *__restrict__ const T *__restrict__ const T *__restrict__ const T *__restrict__ const T *__restrict__ const T *__restrict__ const T *__restrict__ const T *__restrict__ g33
Definition: ax_helm_kernel.h:158
g11
__global__ void const T *__restrict__ const T *__restrict__ const T *__restrict__ const T *__restrict__ const T *__restrict__ const T *__restrict__ g11
Definition: ax_helm_kernel.h:156
max
#define max(a, b)
Definition: tensor.cu:40