exam7.c

CSIMPLE2d CFD C源程序

/*
* exam7.c : example 7 for SIMPLE
*/
/*
* 注意C与FORTRAN的差别：
* 1. C中的数组下标是从0开始的,而FORTRAN则是从1开始的
*   因此本程序中的一些量(如L1,L2,L3,M1,M2,M3,NFMAX,nGam,nP,nRho,IPref,JPref)比FORTRAN程序中的小1
*   所有数组的下标从0开始,程序中数组下标中出现的数字比FORTRAN中的小1
* 2. C的数组是按行优先读的,而FORTRAN的则是按列读的
*   因此本程序中的F的定义不同,是F[NFMAX][I][J]
* 3. C用指针来实现FORTRAN的EQUIVALENCE功能。
*   如定义double (*U)[NSIZE],U=F[0],则U[i][j]等同于F[0][i][j];
*/

#include "staincl.h"
#include "extern.h"

/*global variable for user */
	double (*T)[NSIZE];
	double (*W)[NSIZE];
	double Pr;
	double Amu;
	double Amup;
	double WBAR;
	double FRe;
	double dPdZ;
	double GBR;

/*******************************************************************************
* functon name:	fnGrid
* description:	in this file you should do:
*			--initialize variable you defined
*			--set the filename of the output file, the step can be ignored 
*			--set the title of the variable that will be calculated
*			--set which variable will be calc and print
*			--set axis mode-nMode: 1-cartesian, 2-axisymmetric, 3-polar
*			--set the number of steps
*			--set the number of grids
*			--devide grids
********************************************************************************/
void fnGrid()
{
	int i;

	T=F[3];
	W=F[4];

	szTitle[0]="U";
	szTitle[1]="V";
	szTitle[2]="Str Fun";
	szTitle[3]="temprature";
	szTitle[10]="pressure";
	szTitle[4]="W/WBAR";
	Relax[0]=0.5;
	Relax[1]=0.5;
	Relax[10]=0.8;
	for( i=0;i<=3;i++)
	{
		bSolve[i]=TRUE;
		bPrint[i]=TRUE;
	}
	bPrint[10]=TRUE;
	bPrint[4]=TRUE;
	iLast=25;
	XL=1;
	YL=1;
	L1=6;//
	M1=6;//

	fnUGrid();
}

/*******************************************************************************
* functon name:	fnStart
* description:	in this file you should do:
*			--initialize the 
********************************************************************************/
void fnStart()
{
	int i,j;
	GBR=1e4;
	dPdZ=-3000;
	for( i=0;i<=L1;i++)
	{
		for( j=0;j<=M1;j++)
		{
			U[i][j]=0;
			V[i][j]=0;
			T[i][j]=0;
			T[L1][j]=1;
			W[i][j]=100;
			if(i==0||i==L1)
				W[i][j]=0;
			if(j==0||j==M1)
				W[i][j]=0;
		}
	}
	Pr=0.7;
	Amu=1;
	Amup=Amu/Pr;
}

/*******************************************************************************
* functon name:	fnDense
* description:	in this file you should do:
*			--calc the density if needed
********************************************************************************/
void fnDense()
{

}

/*******************************************************************************
* functon name:	fnbound
* description:	in this file you should do:
*			--calc the boundary
********************************************************************************/
void fnBound()
{
	int i,j,n;
	FRe=0;
	if(iIter>=20)
	{
		if(!bSolve[4])
		{
			for( n=0;n<=3;n++)
				bSolve[n]=FALSE;
			bSolve[4]=TRUE;
		}
		WBAR=0;
		for( i=1;i<=L2;i++)
			for( j=1;j<=M2;j++)
				WBAR+=W[i][j]*XCV[i]*YCV[j];
		FRe=-dPdZ*2*XL*YL/(WBAR*Amu);
	}
}

/*******************************************************************************
* functon name:	fnOutput
* description:	in this file you should do:
*			--print calc info to terminal or write to file
********************************************************************************/
void fnOutPut()
{
	int i,j;
	if(iIter==0)
		fprintf(pFileOut,"\n    Iter    SMax    SSum      V[6][4]      T[2][6]  F*Re");
	fprintf(pFileOut,"\n  %4d  %12.3e  %12.3e  %12.3e  %12.3e ",iIter,SMax,SSum,V[5][3],T[1][5],FRe);

	if(iIter==iLast)
	{
		for( i=0;i<=L1;i++)
			for( j=0;j<=M1;j++)
				W[i][j]/=WBAR;
		fnPrint();
	}
}

/*******************************************************************************
* functon name:	fnGamsor
* description:	in this file you should do:
*			--set the gam 
*			--set the sc,sp
********************************************************************************/
void fnGamSor()
{
	int i,j;
	for( i=0;i<=L1;i++)
	{
		for( j=0;j<=M1;j++)
		{
			Gam[i][j]=Amu;
			if(nF==3)
			{
				Gam[i][j]=Amup;
				Gam[i][0]=0;
				Gam[i][M1]=0;
			}
		}
	}
	for(i=1;i<=L2;i++)
	{
		for( j=1;j<=M2;j++)
		{
			if(nF==1)
			{
				if(j!=1)
					Con[i][j]=(T[i][j]+T[i][j-1])/2*GBR;
			}
			else if(nF==4)
				Con[i][j]=-dPdZ;
		}
	}
}