1 | subroutine rhs(F1,F2,F3,F4,F5,s2u,s2v,s2w,ds2dz,s1u,s1v,s1w, |
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2 | * p_cplx,Tr1,Tr2,Tr3,Tr4,Tr5,amp,dt,myid, |
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3 | * num_dims,locnx,ny,nz,wnx,wny,wnz, |
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4 | * bc_flag) |
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5 | |
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6 | C---------------------------------------------------------------------- |
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7 | C rhs - Computes the transfer terms for the momentum and pert. density |
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8 | c equations. N.B. all terms included except viscous/diffusive |
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9 | c terms which are integrated analytically. |
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10 | C |
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11 | C input: F1,F2,F3 (complex arrays of locnx by ny+1 by nz+1) |
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12 | C i, j, k components of the cross product of velocity |
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13 | C and vorticity + rotation & buoyancy |
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14 | C s1u, s1v, s1w product of scalar (1) and the u, v, and w |
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15 | C F4 -u dot grad s1_bar |
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16 | C F5 -u dot grad s2_bar |
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17 | c s2u,s2v,s2w s2*u, s2*v, s2*w |
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18 | c ds2dz ds2dz |
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19 | C p_cplx transform of d/dz s1_bar |
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20 | C amp amplification arrays exp(-dt*gamma*"k"^p) (see fill_wave_vectors.f) |
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21 | C nx, ny, nz (integers) - size of physical space data |
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22 | C num_dims number of dimensions 2(xz) or 3(xyz) z pos up |
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23 | C wnx, wny, wnz (real arrays of locnx, ny+1, nz+1, respectively) |
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24 | C contains x, y and z wavenumbers |
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25 | C dt dimensionless time step |
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26 | C |
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27 | C output: Tr1,Tr2,Tr3,Tr4 - contains the spectral representations of |
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28 | C transfer terms for u, v, w and pert. density |
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29 | C p_cplx transform of pressure variable |
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30 | C |
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31 | C----------------------------------------------------------------------- |
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32 | |
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33 | implicit none |
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34 | integer locnx,ny,nz,num_dims,nyplanes,i,j,k,myid,isign |
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35 | complex F1(locnx,ny+1,nz+1), F2(locnx,ny+1,nz+1) |
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36 | complex F3(locnx,ny+1,nz+1), F4(locnx,ny+1,nz+1) |
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37 | complex F5(locnx,ny+1,nz+1) |
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38 | complex ds2dz(locnx,ny+1,nz+1) |
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39 | complex s1u(locnx,ny+1,nz+1), s1v(locnx,ny+1,nz+1) |
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40 | complex s1w(locnx,ny+1,nz+1),cmplxi |
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41 | complex s2u(locnx,ny+1,nz+1), s2v(locnx,ny+1,nz+1) |
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42 | complex s2w(locnx,ny+1,nz+1) |
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43 | complex p_cplx(locnx,ny+1,nz+1),C |
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44 | real amp(locnx,ny+1,nz+1,2) |
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45 | complex Tr1(locnx,ny+1,nz+1),Tr2(locnx,ny+1,nz+1) |
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46 | complex Tr3(locnx,ny+1,nz+1),Tr4(locnx,ny+1,nz+1) |
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47 | complex Tr5(locnx,ny+1,nz+1) |
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48 | real wnx(locnx),wny(ny+1),wnz(nz+1),kappa2,factor,dt |
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49 | character*80 bc_flag |
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50 | |
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51 | cmplxi = (0.0,1.0) |
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52 | if( num_dims .eq. 2 ) then |
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53 | nyplanes=1 |
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54 | elseif( num_dims .eq. 3 ) then |
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55 | nyplanes=ny |
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56 | endif |
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57 | |
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58 | if( bc_flag .eq. 'zperiodic' ) then ! fourier in 3d, --> d/dx --> ik |
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59 | C= -cmplxi |
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60 | do k = 1, nz |
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61 | do j = 1, nyplanes |
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62 | do i = 1,locnx |
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63 | |
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64 | kappa2 = (wnx(i)**2) + (wny(j)**2) + (wnz(k)**2) |
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65 | if (kappa2 .eq. 0.0) then |
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66 | kappa2 = 1.e33 |
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67 | F1(i,j,k)=0. |
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68 | F2(i,j,k)=0. |
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69 | F3(i,j,k)=0. |
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70 | endif |
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71 | if( amp(i,j,k,2) .eq. 0 .or. wnz(k) .eq. 0 ) then |
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72 | factor=0.0 |
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73 | else |
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74 | factor = (-C/wnz(k))*log( amp(i,j,k,2) )/dt ! strip -gamma*"k"^p from amp, mult by -i or 1 over m |
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75 | endif |
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76 | |
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77 | C+ |
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78 | C scalar s1 and s2 equations: Tr4, Tr5 |
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79 | C- |
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80 | Tr4(i,j,k) = -cmplxi*wnx(i)*s1u(i,j,k) |
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81 | * -cmplxi*wny(j)*s1v(i,j,k) |
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82 | * -cmplxi*wnz(k)*s1w(i,j,k) |
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83 | * +F4(i,j,k) + factor*p_cplx(i,j,k) ! p_cplx has transform of d/dz s1_bar |
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84 | |
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85 | Tr5(i,j,k) = -cmplxi*wnx(i)*s2u(i,j,k) |
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86 | * -cmplxi*wny(j)*s2v(i,j,k) |
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87 | * -cmplxi*wnz(k)*s2w(i,j,k) |
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88 | * +F5(i,j,k) + factor*ds2dz(i,j,k) |
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89 | |
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90 | |
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91 | C+ |
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92 | C u, v & w equations: Tr1, Tr2, Tr3 |
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93 | C- |
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94 | Tr1(i,j,k) = ((wny(j)**2 + wnz(k)**2)/kappa2)*F1(i,j,k) |
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95 | * - (wnx(i)*wny(j)/kappa2)*F2(i,j,k) |
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96 | * - (wnx(i)*wnz(k)/kappa2)*F3(i,j,k) |
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97 | |
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98 | Tr2(i,j,k) = - (wnx(i)*wny(j)/kappa2)*F1(i,j,k) |
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99 | * + ((wnx(i)**2 + wnz(k)**2)/kappa2)*F2(i,j,k) |
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100 | * - (wny(j)*wnz(k)/kappa2)*F3(i,j,k) |
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101 | |
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102 | Tr3(i,j,k) = - (wnx(i)*wnz(k)/kappa2)*F1(i,j,k) |
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103 | * - (wny(j)*wnz(k)/kappa2)*F2(i,j,k) |
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104 | * + ((wnx(i)**2 + wny(j)**2)/kappa2)*F3(i,j,k) |
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105 | |
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106 | C |
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107 | C calculate pressure |
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108 | C |
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109 | p_cplx(i,j,k) = -(cmplxi*wnx(i)*F1(i,j,k)+cmplxi*wny(j)*F2(i,j,k) |
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110 | * +cmplxi*wnz(k)*F3(i,j,k))/kappa2 ! overwrite w/ pressure transform |
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111 | |
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112 | enddo |
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113 | enddo |
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114 | enddo |
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115 | |
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116 | elseif( bc_flag .eq. 'zslip' ) then ! sin/cos polarity for z derivatives |
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117 | C= 1.0 |
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118 | |
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119 | isign=-1 ! see rhs for s1 eqn |
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120 | |
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121 | do k = 1, nz+1 |
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122 | do j = 1, nyplanes |
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123 | do i = 1, locnx |
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124 | |
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125 | kappa2 = (wnx(i)**2) + (wny(j)**2) + (wnz(k)**2) |
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126 | if (kappa2 .eq. 0.0) then |
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127 | kappa2 = 1.e33 |
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128 | F1(i,j,k)=0. |
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129 | F2(i,j,k)=0. |
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130 | F3(i,j,k)=0. |
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131 | endif |
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132 | if( amp(i,j,k,2) .eq. 0 .or. wnz(k) .eq. 0 ) then |
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133 | factor=0.0 |
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134 | else |
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135 | factor = (-C/wnz(k))*log( amp(i,j,k,2) )/dt ! strip -gamma*"k"^p from amp, mult by -i or 1 over m |
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136 | endif |
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137 | |
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138 | C+ |
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139 | C scalar s1 and s2 equations: Tr4, Tr5 |
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140 | C- |
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141 | Tr4(i,j,k) = - cmplxi*wnx(i)*s1u(i,j,k) |
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142 | * - cmplxi*wny(j)*s1v(i,j,k) |
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143 | * - isign*wnz(k)*s1w(i,j,k) |
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144 | * + F4(i,j,k) + factor*p_cplx(i,j,k) ! p_cplx has transform of d/dz rho_bar on input |
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145 | |
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146 | Tr5(i,j,k) = -cmplxi*wnx(i)*s2u(i,j,k) |
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147 | * -cmplxi*wny(j)*s2v(i,j,k) |
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148 | * -isign*wnz(k)*s2w(i,j,k) |
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149 | * +F5(i,j,k) + factor*ds2dz(i,j,k) |
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150 | |
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151 | C+ |
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152 | C u, v & w equations: Tr1, Tr2, Tr3 |
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153 | C- |
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154 | Tr1(i,j,k) = ((wny(j)**2 + wnz(k)**2)/kappa2)*F1(i,j,k) |
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155 | * - (wnx(i)*wny(j)/kappa2)*F2(i,j,k) |
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156 | * + (cmplxi*wnx(i)*wnz(k)/kappa2)*F3(i,j,k) |
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157 | |
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158 | Tr2(i,j,k) = - (wnx(i)*wny(j)/kappa2)*F1(i,j,k) |
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159 | * + ((wnx(i)**2 + wnz(k)**2)/kappa2)*F2(i,j,k) |
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160 | * + (cmplxi*wny(j)*wnz(k)/kappa2)*F3(i,j,k) |
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161 | |
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162 | |
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163 | Tr3(i,j,k) = - (cmplxi*wnx(i)*wnz(k)/kappa2)*F1(i,j,k) |
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164 | * - (cmplxi*wny(j)*wnz(k)/kappa2)*F2(i,j,k) |
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165 | * + ((wnx(i)**2 + wny(j)**2)/kappa2)*F3(i,j,k) |
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166 | |
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167 | C |
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168 | C calculate pressure |
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169 | C |
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170 | p_cplx(i,j,k) = -(cmplxi*wnx(i)*F1(i,j,k)+cmplxi*wny(j)*F2(i,j,k) |
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171 | * +wnz(k)*F3(i,j,k))/kappa2 ! overwrite w/ pressure transform |
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172 | |
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173 | enddo |
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174 | enddo |
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175 | enddo |
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176 | |
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177 | endif |
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178 | |
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179 | if( myid .eq. 0 ) then ! 1,1,1 location corresponds to (k,l,m)=(0,0,0) |
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180 | Tr1(1,1,1) = F1(1,1,1) ! Rot*v |
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181 | Tr2(1,1,1) = F2(1,1,1) ! -Rot*u |
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182 | C disallow net vertical velocity |
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183 | Tr3(1,1,1) = 0. |
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184 | c set mean pressure to zero |
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185 | p_cplx(1,1,1) = 0. |
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186 | endif |
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187 | |
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188 | return |
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189 | end |
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