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From simplefoam to rhosimplefoam

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Old   December 13, 2017, 13:08
Default From simplefoam to rhosimplefoam
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michelangelo
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Hi everyone,
I'm quite new to this world, so I'm sorry if I forgot doing something else before this.

I have done a mesh of an object and run it using the SimpleFoam solver, and it definitely works after a lot of attempts.
The residue is correct and the solution is as expected.

I've surfed the site but I can't find (and I think is my fault) anything teaching me from ground level how to switch a good simulation working in simplefoam to rhosimplefoam.

Maybe I have to start again from zero level, but before doing this I would like to be sure I'm not loosing time.

The fact is that I would like to push the velocity up to early transonic regime (Mach = 0.6-0.7) and I would like to see the correct loads over the object in a steady case.

Anything included a link to a guide or similar would be really appreciated.

Sorry for my english and if I didn't do the correct job, I will do eveything for being correct again.
Thanks in advance !

aeromaik
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Old   September 9, 2019, 05:53
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Kmeti Rao
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Hi aeromik,

It's been long since you posted, but if you remember your findings, can you please share it here. It would be very useful.

Thank you,
Krao
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Old   September 9, 2019, 09:05
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Carlo_P
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Hey,

I didi lots of time, since I normally initialize the rhosimplefoma with simplefoam.
You can try this step:


1) Change the p file. You have to change the dimension, look at one p file in tutorial. You have also to add the atmosferic pressure.


2) Add the T file


2) Add transonic yes (if it is transonic) in your FvOption - Simple


3) Add a small value for the relaxation factor of rho.


4) You have to change the numerics in fvSchemes. Try and read the error in openfoam.


Try this step. I'm not sure that they are all.
Cheers,
Carlo
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Old   September 10, 2019, 11:02
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Kmeti Rao
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Quote:
Originally Posted by Carlo_P View Post
Hey,

I didi lots of time, since I normally initialize the rhosimplefoma with simplefoam.
You can try this step:


1) Change the p file. You have to change the dimension, look at one p file in tutorial. You have also to add the atmosferic pressure.


2) Add the T file


2) Add transonic yes (if it is transonic) in your FvOption - Simple


3) Add a small value for the relaxation factor of rho.


4) You have to change the numerics in fvSchemes. Try and read the error in openfoam.


Try this step. I'm not sure that they are all.
Cheers,
Carlo

Thanks Carlos for your kind reply, I will work on with the given inputs from your side.

Regards
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Old   September 16, 2019, 11:25
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Kmeti Rao
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Hi Carlo,

I did as specified by you and somehow my simulation started running, thank you. But I need to understand the underlying physics, to analyse the results.

My operational range is always about Ma: 0.3, and I am using SimpleFoam with MRF for this, but I am curious to know the results in non-design operating conditions therefore I'm studying the behavior at Ma: 0.5. Therefore it would be nice if you can suggest any similar tutorial, which I can follow and implement those settings to my rhoSimpleFoam with MRF. Also, I would be grateful if you can suggest me related literature.

Regards,
Krao
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