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How to remove viscosity term from the governing equation in interFoam solver

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Old   February 17, 2022, 15:56
Default How to remove viscosity term from the governing equation in interFoam solver
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Basar H.Ibrahim
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Hello All

After I modified interFoam solver to newInterFoam solver,
I want to remove the viscosity term from the governing equation,
And I know that the library that controls the transport properties is src/transportModels/immiscibleIncompressibleTwoPhaseMixture,
And this library includes two other libraries which are

#include "incompressibleTwoPhaseMixture.H"
#include "interfaceProperties.H"

So, I modified these libraries and copied them into my user directory as well,
and I made wmake and my new solver works very well.

I am trying to modify these libraries but I don't know which part should I remove

My question
1- is this way is true to remove the viscosity term?
2- which libraries should I modify?

By the way, I have made a lot of tests by modifying the libraries but I still got errors.

Best Regards
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Old   February 18, 2022, 06:23
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Domenico Lahaye
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1/ To set viscosity to zero, it suffices to set the molecular diffusion constant equal zero in the constant/transportProperties file;

2/ It is likely that the solver fails to converge in the absence of diffusion;

Best, Domenico.
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Old   February 18, 2022, 06:38
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Basar H.Ibrahim
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Quote:
Originally Posted by dlahaye View Post
1/ To set viscosity to zero, it suffices to set the molecular diffusion constant equal zero in the constant/transportProperties file;

2/ It is likely that the solver fails to converge in the absence of diffusion;

Best, Domenico.
I did these steps, but the solver didn't work.
If the solver works correctly it is not what I want
What I want to do is to remove from the source code.
In general I want to make new solver with out viscosity.

thankyou for your reply dlahaye
Best regards.
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Old   February 18, 2022, 06:56
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Domenico Lahaye
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Removing the diffusion term from the source code is a very humble endaveour.

I seriously doubt it will converge. Diffusion is often required to obtain converge. Stated differently, to obtain convergence is the absence of diffusion, other discretization techniques and solvers might be required.

The book by LeVeque https://www.cambridge.org/core/books...D52EAD6909E2B9 among many others might be a good reference.
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