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【求助】传热计算的OpenMP并行计算
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请大家帮帮忙 在温度场的计算过程中，时间步长上的迭代过程是相互关联，相互影响的。一次迭代需要使用上一次迭代的运算结果，故迭代之间不宜实现并行化。而在一次迭代内部，温度场的计算仅需要前一次时刻的计算结果，各个计算过程之间没有影响，可以进行并行计算。但我进行以下的并行计算后结果同串行相差很大，且计算时间反而增加。 以下即是我的并行程序，用到的OpenMP指令是section指令： （其中，程序中的h_w_f，Water_Tem_in，Mould_dt，Mould_dy等为全局变量，AA、BB、C_mould，float Density_mould等为局部变量，q1，Q2,q3，Q4为调用函数。） for(k=0;k<100;k++) { for(i=0;i<=xx;i++) { for(j=0;j<=yy;j++) { thermal_1[j]=thermal_0[j]; } } #pragma omp parallel sections { #pragma omp section { for(i=0;i<=xx;i++) { for(j=0;j<=yA;j++) { if (i==xK && j==0)//K { thermal_0[j] = float(2*AA*thermal_1[i+1][j]+2*BB*thermal_1[j+1]+thermal_1[j]*(1-2*AA-2*BB) +2*h_w_f*(Water_Tem_in - thermal_1[j])*Mould_dt/(Mould_dy*C_mould*Density_mould)); } else if (i==xJ && j==0)//J { thermal_0[j] = float(2*AA*thermal_1[i-1][j]+2*BB*thermal_1[j+1]+thermal_1[j]*(1-2*AA-2*BB) +2*h_w_f*(Water_Tem_in - thermal_1[j])*Mould_dt/(Mould_dy*C_mould*Density_mould)); } //////////[side] else if ((i>=xK && i<=xJ) && j==0)//KJ { thermal_0[j] = float(AA*(thermal_1[i-1][j]+thermal_1[i+1][j])+2*BB*(thermal_1[j+1]) +thermal_1[j]*(1-2*AA-2*BB) +2*h_w_f*(Water_Tem_in - thermal_1[j])*Mould_dt/(Mould_dy*C_mould*Density_mould)); } else if (i==xJ && (j>=0 && j<=yA))//JP { thermal_0[j] = float(2*AA*(thermal_1[i-1][j])+BB*(thermal_1[j-1]+thermal_1[j+1]) +thermal_1[j]*(1-2*AA-2*BB)); } else if ((i>=xK && i<=xJ) && j==yA)//PL { thermal_0[j] = float(AA*(thermal_1[i-1][j]+thermal_1[i+1][j])+2*BB*(thermal_1[j-1]) +thermal_1[j]*(1-2*AA-2*BB)+2*Q4(i-xK)*Mould_dt/(Mould_dy*C_mould*Density_mould)); } else if (i==xK && (j>=0 && j<=yA))//LK { thermal_0[j] = float(2*AA*(thermal_1[i+1][j])+BB*(thermal_1[j-1]+thermal_1[j+1])+thermal_1[j]*(1-2*AA-2*BB)); } else if ((i>=xK && i<=xJ) && (j<=yA) )// fix { thermal_0[j] = float(AA*(thermal_1[i-1][j]+thermal_1[i+1][j])+BB*(thermal_1[j-1]+thermal_1[j+1])+thermal_1[j]*(1.0-2*AA-2*BB)); } } } } #pragma omp section { for(i=0;i<=xx;i++) { for(j=yB;j<=yy;j++) { if (i==xJ && j==yy)//E { thermal_0[j] = float(2*AA*thermal_1[i-1][j]+2*BB*thermal_1[j-1]+thermal_1[j]*(1-2*AA-2*BB) +2*h_w_l*(Water_Tem_in - thermal_1[j])*Mould_dt/(Mould_dy*C_mould*Density_mould)); } else if (i==xK && j==yy)//D { thermal_0[j] = float(2*AA*thermal_1[i+1][j]+2*BB*thermal_1[j-1]+thermal_1[j]*(1-2*AA-2*BB) +2*h_w_l*(Water_Tem_in - thermal_1[j])*Mould_dt/(Mould_dy*C_mould*Density_mould)); } ////side else if ((i>=xK && i<=xJ) && j==yB)//MN { thermal_0[j] = float(AA*(thermal_1[i-1][j]+thermal_1[i+1][j])+2*BB*(thermal_1[j+1]) +thermal_1[j]*(1-2*AA-2*BB)+2*Q2(i-xK)*Mould_dt/(Mould_dy*C_mould*Density_mould)); } else if (i==xJ && (j>=yB && j<=yy))//NE { thermal_0[j] = float(2*AA*(thermal_1[i-1][j])+BB*(thermal_1[j-1]+thermal_1[j+1])+thermal_1[j]*(1-2*AA-2*BB)); } else if ((i>=xK && i<=xJ) && j==yy)//ED { thermal_0[j] = float(AA*(thermal_1[i-1][j]+thermal_1[i+1][j])+2*BB*(thermal_1[j-1])+thermal_1[j]*(1-2*AA-2*BB) +2*h_w_l*(Water_Tem_in - thermal_1[j])*Mould_dt/(Mould_dy*C_mould*Density_mould)); } else if (i==xK && (j>=yB && j<=yy))//DM { thermal_0[j] = float(2*AA*(thermal_1[i+1][j])+BB*(thermal_1[j-1]+thermal_1[j+1])+thermal_1[j]*(1-2*AA-2*BB)); } else if((i>=xK && i<=xJ) && (j>=yB))// loose { thermal_0[j] = float(AA*(thermal_1[i-1][j]+thermal_1[i+1][j])+BB*(thermal_1[j-1]+thermal_1[j+1])+thermal_1[j]*(1.0-2*AA-2*BB)); } } } } #pragma omp section { for(i=0;i<=xK;i++) { for(j=yA;j<=yB;j++) { if (i==0 && j==yA)//A { thermal_0[j] = float(2*AA*thermal_1[i+1][j]+2*BB*thermal_1[j+1]+thermal_1[j]*(1-2*AA-2*BB) +2*h_n_l*(Water_Tem_in - thermal_1[j])*Mould_dt/(Mould_dx*C_mould*Density_mould)); } else if (i==0 && j==yB)//B { thermal_0[j] = float(2*AA*thermal_1[i+1][j]+2*BB*thermal_1[j-1]+thermal_1[j]*(1-2*AA-2*BB) +2*h_n_l*(Water_Tem_in - thermal_1[j])*Mould_dt/(Mould_dx*C_mould*Density_mould)); } else if (i==xK && j==yA)//L { thermal_0[j] = float(AA*(thermal_1[i-1][j]+thermal_1[i+1][j])+BB*(thermal_1[j-1]+thermal_1[j+1])+thermal_1[j]*(1-2*AA-2*BB) +Q4(i-xK)*Mould_dt/(Mould_dy*C_mould*Density_mould)+q1(j)*Mould_dt/(Mould_dx*C_mould*Density_mould)); } else if (i==xK && j==yB)//M { thermal_0[j] = float(AA*(thermal_1[i-1][j]+thermal_1[i+1][j])+BB*(thermal_1[j-1]+thermal_1[j+1])+thermal_1[j]*(1-2*AA-2*BB) +Q2(i-xK)*Mould_dt/(Mould_dy*C_mould*Density_mould)+q1(j)*Mould_dt/(Mould_dx*C_mould*Density_mould)); } ///side else if ((i>=0 && i<=xK) && j==yA)//AL { thermal_0[j] = float(AA*(thermal_1[i-1][j]+thermal_1[i+1][j])+2*BB*(thermal_1[j+1])+thermal_1[j]*(1-2*AA-2*BB)); } else if (i==xK && (j>=yA && j<=yB))//LM { thermal_0[j] = float(2*AA*(thermal_1[i-1][j])+BB*(thermal_1[j-1]+thermal_1[j+1]) +thermal_1[j]*(1-2*AA-2*BB)+2*q1(j)*Mould_dt/(Mould_dx*C_mould*Density_mould)); } else if ((i>=0 && i<=xK) && j==yB)//MB { thermal_0[j] = float(AA*(thermal_1[i-1][j]+thermal_1[i+1][j])+2*BB*(thermal_1[j-1])+thermal_1[j]*(1-2*AA-2*BB)); } else if (i==0 && (j>=yA && j<=yB))//BA { thermal_0[j] = float(2*AA*(thermal_1[i+1][j])+BB*(thermal_1[j-1]+thermal_1[j+1])+thermal_1[j]*(1-2*AA-2*BB) +2*h_n_l*(Water_Tem_in - thermal_1[j])*Mould_dt/(Mould_dx*C_mould*Density_mould)); } else if (i<=xK && (j>=yA && j<=yB))// left { thermal_0[j] = float(AA*(thermal_1[i-1][j]+thermal_1[i+1][j])+BB*(thermal_1[j-1]+thermal_1[j+1])+thermal_1[j]*(1.0-2*AA-2*BB)); } } } } #pragma omp section { for(i=xJ;i<=xx;i++) { for(j=yA;j<=yB;j++) { if (i==xJ && j==yA)//P { thermal_0[j] = float(AA*(thermal_1[i-1][j]+thermal_1[i+1][j])+BB*(thermal_1[j-1]+thermal_1[j+1])+thermal_1[j]*(1-2*AA-2*BB) +Q4(i-xK)*Mould_dt/(Mould_dy*C_mould*Density_mould)+q3(j)*Mould_dt/(Mould_dx*C_mould*Density_mould)); } else if (i==xx && j==yA)//H { thermal_0[j] = float(2*AA*thermal_1[i-1][j]+2*BB*thermal_1[j+1]+thermal_1[j]*(1-2*AA-2*BB) +2*h_n_r*(Water_Tem_in - thermal_1[j])*Mould_dt/(Mould_dx*C_mould*Density_mould)); } else if (i==xJ && j==yB)//N { thermal_0[j] = float(AA*(thermal_1[i-1][j]+thermal_1[i+1][j])+BB*(thermal_1[j-1]+thermal_1[j+1])+thermal_1[j]*(1-2*AA-2*BB) +Q2(i-xK)*Mould_dt/(Mould_dy*C_mould*Density_mould)+q3(j)*Mould_dt/(Mould_dx*C_mould*Density_mould)); } else if (i==xx && j==yB)//G { thermal_0[j] = float(2*AA*thermal_1[i-1][j]+2*BB*thermal_1[j-1]+thermal_1[j]*(1-2*AA-2*BB) +2*h_n_r*(Water_Tem_in - thermal_1[j])*Mould_dt/(Mould_dx*C_mould*Density_mould)); } ////side else if ((i>=xJ && i<=xx) && j==yA)//PH { thermal_0[j] = float(AA*(thermal_1[i-1][j]+thermal_1[i+1][j])+2*BB*(thermal_1[j+1])+thermal_1[j]*(1-2*AA-2*BB)); } else if (i==xx && (j>=yA && j<=yB))//HG { thermal_0[j] = float(2*AA*(thermal_1[i-1][j])+BB*(thermal_1[j-1]+thermal_1[j+1]) +thermal_1[j]*(1-2*AA-2*BB)+2*h_n_r*(Water_Tem_in - thermal_1[j])*Mould_dt/(Mould_dx*C_mould*Density_mould)); } else if ((i>=xJ && i<=xx) && j==yB)//GN { thermal_0[j] = float(AA*(thermal_1[i-1][j]+thermal_1[i+1][j])+2*BB*(thermal_1[j-1])+thermal_1[j]*(1-2*AA-2*BB)); } else if (i==xJ && (j>=yA && j<=yB))//NP { thermal_0[j] = float(2*AA*(thermal_1[i+1][j])+BB*(thermal_1[j-1]+thermal_1[j+1]) +thermal_1[j]*(1-2*AA-2*BB)+2*q3(j)*Mould_dt/(Mould_dx*C_mould*Density_mould)); } else if ( i>=xJ && (j>=yA && j<=yB))// right { thermal_0[j] = float(AA*(thermal_1[i-1][j]+thermal_1[i+1][j])+BB*(thermal_1[j-1]+thermal_1[j+1])+thermal_1[j]*(1.0-2*AA-2*BB)); } } } } } } |
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