komega模型求解传热算例的报错

一颗鸭蛋

各位老师好，我是在DNS求解器的基础上引入湍流kOMega模型，并加入温度方程引入湍流热扩散系数（参照OF2.3中的传热求解器buoyanBoussinesqPimpleFoam 中的热扩散系数代码），求解器编译通过。

参考代码：

alphat = turbulence->nut()/Prt;
alphat.correctBoundaryConditions();

volScalarField alphaEff("alphaEff", turbulence->nu()/Pr + alphat);

报错如下：

Reading field T

Reading/calculating face flux field phi

Reading field phi_0

Creating turbulence model

Selecting incompressible transport model Newtonian
Selecting turbulence model type RASModel
Selecting RAS turbulence model kOmegaMHD//这里以上都能正确读取各个声明的场和模型，接下去本应该读取热扩散系数的alpha场的，但报以下一些错误。
bounding omega, min: 0 max: 0 average: 0
[39] [1] #0  Foam::error::printStack(Foam::Ostream&)[2] [11] [44] #[25] #0      
Foam::error::printStack(Foam::Ostream&)#0  
Foam::error::printStack(Foam::Ostream&)[26] #0      
Foam::error::printStack(Foam::Ostream&)[40] #0  

[16] #1  Foam::sigFpe::sigHandler(int) at ??:?//这个错误是除零错误
[37] #1  Foam::sigFpe::sigHandler(int)[20] #0  Foam::error::printStack(Foam::Ostream&) at ??:?
[2] #1  Foam::sigFpe::sigHandler(int) at ??:?
[47] #4  void Foam::divide<Foam::fvPatchField, Foam::volMesh>(Foam::GeometricField<double, Foam::fvPatchField, Foam::volMesh>&, Foam::GeometricField<double, Foam::fvPatchField, Foam::volMesh> const&, Foam::GeometricField<double, Foam::fvPatchField, Foam::volMesh> const&) in "/lib/x86_64-linux-gnu/libc.so.6"
[23] #3  Foam::divide(Foam::Field<double>&, 
Foam::UList<double> const&, Foam::UList<double> const&) at ??:?

[kdd:28991] *** Process received signal ***
[kdd:28991] Signal: Floating point exception (8)//浮点数例外错误
[kdd:28991] Signal code:  (-6)
[kdd:28991] Failing at address: 0x3e80000713f

--------------------------------------------------------------------------
mpirun noticed that process rank 30 with PID 31201 on node kdd exited on signal 8 (Floating point exception).
--------------------------------------------------------------------------
2 total processes killed (some possibly by mpirun during cleanup)

自带的模型中的Omega方程中的热扩散系数alpha如何理解?我本来将代码中的综合热扩散系数alphaEff去掉，并把alpht改成alpha来表示湍流热扩散系数来与模型保持一致，但依然报如上错误。

OF自带的模型中的Omega方程

tmp<fvScalarMatrix> omegaEqn
(
    fvm::ddt(omega_)
  + fvm::div(phi_, omega_)
  - fvm::laplacian(DomegaEff(), omega_)
 ==
    alpha_*G*omega_/k_
  - fvm::Sp(beta_*omega_, omega_)
);

李东岳

Selecting incompressible transport model Newtonian
Selecting turbulence model type RASModel
Selecting RAS turbulence model kOmegaMHD//这里以上都能正确读取各个声明的场和模型，接下去本应该读取热扩散系数的alpha场的，但报以下一些错误。
bounding omega, min: 0 max: 0 average: 0
[39] [1] #0  Foam::error::printStack(Foam::Ostream&)[2] [11] [44] #[25] #0      
Foam::error::printStack(Foam::Ostream&)#0  
Foam::error::printStack(Foam::Ostream&)[26] #0      
Foam::error::printStack(Foam::Ostream&)[40] #0

不太好判断呀，一上来就报错了，不太好判断

一颗鸭蛋

是啊，老师。希望有人遇到过，给我解解惑，哈哈~

bestucan

我记得openfoam的DNS不能用并行。可以试试不用并行能不能算。

一颗鸭蛋

问题解决了，是因为我将Omega设置为零了，所以在计算的时，湍流模型在算湍流黏性系数是nut=k/Omega 出现除零错误。