forAll(x, celli)//对所有的体x进行计算
{
x[celli] = x[celli] *mesh.V()[celli];//此处即为每个网格的x*网格体积
}
scalar sumx = gSum(x);//对所有的x*网格体积进行加和
scalar V = gSum(mesh.V());//计算总网格体积
scalar Final = sumx/V;//计算体均湍流动能耗散率
Info << runTime.timeName() <<" volume average x is "<<x<<endl;//输出结果