均一的边界条件如何设置？

搬运工不好当

有没有人了解OF中非均一的边界条件如何设置？比如有一个竖直的壁面，壁面低端温度300K，顶端温度800K，壁面上温度线性变化，这种边界条件该如何设置呢？

zhanghan

@搬运工不好当
我想设置通道表面热损失边界条件，和您的线性变化是一样的吗？？？该怎么设置呢？？

赵一铭

@zhanghan 在均一的边界条件如何设置？中说：

通道表面热损失边界条件

这个具体值得是什么边界条件？固定热通量流出？

zhanghan

@赵一铭
CFX中是通道表面热损失单位是W/m2

赵一铭

@zhanghan

可以试试turbulentHeatFlux边界条件：

Fixed heat boundary condition to specify temperature gradient. Input heat source either specified in terms of an absolute power [W], or as a flux [W/m2].

Example usage:

        hotWall
        {
            type            compressible::turbulentHeatFluxTemperature;
            heatSource      flux;        // power [W]; flux [W/m2]
            q               uniform 10;  // heat power or flux
            kappa           fluidThermo; // calculate kappa=alphaEff*thermo.Cp
            Qr              none;        // name of the radiative flux
            value           uniform 300; // initial temperature value
        }

zhanghan

@赵一铭
感谢您，我打算试试！！

程迪

@搬运工不好当

如果是OpenFOAM和OpenFOAM+，用codedFixedValue最方便：

    wall
    {
        type            codedFixedValue;
        value           uniform 300; //default value
        redirectType    linearTBC; //name of new BC type
        code
        #{
        const vectorField& Cf = patch().Cf(); // get face center coordinate;
        //assume the wall is a vertical wall       
        scalar ymax = max(Cf&vector(0,1,0)); // `&` is dot product
        scalar ymin = min(Cf&vector(0,1,0));
        // Info<<"ymax="<<ymax<<",ymin="<<ymin<<nl;
        
        vectorField& vf = *this; // get the boundary field (List of vectors defined at face centers) to fill.
        //temporal coordinate, type: scalar
        scalar t =this->db().time().value(); // get time
        // temporal term
        // scalar tt = 1+0.1*sin(5*t);
        scalar tt = 1.0;
        forAll(Cf,faceI)
        {
        	//spatial coordinates, type: scalar
        	//scalar x = Cf[faceI].x();
        	scalar y = Cf[faceI].y(); 
        	//scalar z = Cf[faceI].z();
        
        	vf[faceI] = ((y-ymin)/(ymax-ymin)*500+300)*tt; 
        }
        #};
        
        //I do not know why I need to add those things
        //codeInclude
        //#{
        //    #include "fvCFD.H"
        //#};
        
        //codeOptions
        //#{
        //    -I$(LIB_SRC)/finiteVolume/lnInclude
        //#};
    }

anzhenhua

@程迪 scalar t 没有用到？