reactingtwophaseeulerfoam?

[kimy]

@东岳 I am using IPSA model (lauder and spalding). In all of equation used, the alpha term has been introduced inside.
http://www.cham.co.uk/phoenics/d_polis/d_lecs/ipsa/ipsa.htm#11

[kimy]

@东岳 Sorry. I am still confused that how the equation(24) mentioned in your page could be solved in OpenFoam. In the source code:

        solve
        (
            pEqnComp1() + pEqnComp2() + pEqnIncomp,
            mesh.solver(p_rgh.select(pimple.finalInnerIter()))
        );

why pEqnComp1() + pEqnComp2() + pEqnIncomp ranther than - pEqnComp1() - pEqnComp2() + pEqnIncomp. Because in your equation(24), pEqnComp1() + pEqnComp2() in the right side while pEqnIncomp in the left side.

[李东岳]

Thanks for your feedback. The R.H.S. of the following equation should be a - sign. It was corrected.
\begin{equation}\label{comp_nablaU}
\underset{\mathrm{pEqnIncomp}}{\underbrace{\nabla\cdot\left(\alpha_\rd\bfU_\rd+\alpha_\rc\bfU_\rc\right)}}=\underset{\mathrm{\color{red}{-}pEqnComp1\color{red}{-}pEqnComp2}}{\underbrace{-\frac{\alpha_\rd}{\rho_\rd}\frac{\rD\rho_\rd}{\rD t}-\frac{\alpha_\rc}{\rho_\rc}\frac{\rD\rho_\rc}{\rD t} }}.
\end{equation}

What is the first term? Its a second order tensor which is not consistent with the second term (scalar).

[kimy]

@东岳 So if I wanna add the term related to the gradient alpha in the continuity equation, in which place should I put the term?

[kimy]

@东岳 Thanks, Dongyue. I am still confused that why I add the same term in the pEqnComp1 and pEqnComp2, or pEqnIncomp leads to the different results?

[李东岳]

So if I wanna add the term related to the gradient alpha in the continuity equation, in which place should I put the term?

You should implement it in the alpha equation.

[kimy]

@东岳 Sorry, to my knowledge alpha equation dosn't exsist in the twophaseeulerfoam? How can I realize it?

[李东岳]

alpha field was solved by MULES algorithm. You can add something after MULES procedure as follows:

solve(fvm::ddt(alpha) - fvm::laplacian(D, alpha) = fvc::ddt(alpha);

[kimy]

@东岳Thanks. however MULES is not implemented in twophaseeulerfoam. As mentioned before, the term must be added into the continuity equation rather than alpha equa, which is the Spalding's IPSA solver in PHOENICS.

[kimy]

@kimy Sorry, I mean where is the MULES in the twophaseeulerfoam, which I did not find but I found MULES in the terminal during calculation.

[李东岳]

alpha was solved in twoPhaseSystem.C