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-   -   Questions a Laval Nozzle (http://www.cfd-online.com/Forums/openfoam-solving/60635-questions-laval-nozzle.html)

lvxiang March 12, 2005 20:24

Hi,everybody I am a newbie, h
 
Hi,everybody
I am a newbie, have questions about performing CFD on a Laval Nozzle .

I think ,solvers suitable for it are
rhopSonicFoam, rhoSonicFoam , sonicFoam , sonicTurbFoam
Am i right?

The inlet conditions of Total Temperature and Pressure are known. But none of the solvers above have proper BC setting for this. Why?

Can you give me some suggestions?
thx

henry March 13, 2005 05:03

Yes you can use any of those 4
 
Yes you can use any of those 4 solvers depending on your needs.

I guess your inlet is supersonic and that by specifying total pressure and pressure you could also evaluate the inlet velocity and fix that. In which case you can use the supersonic inlet condition.

lvxiang March 16, 2005 03:05

thanks a lot. The inlet is su
 
thanks a lot.
The inlet is subsonic,it will reach supersonic on outlet.
Maybe those solvers arenot suitable,I think,they can be used for supersonic inlets. Although some of them can be used for transonic, but can only for transition from supersonic to subsonic,not from subsonic to supersonic.
Is that so?

henry March 16, 2005 03:10

I do not see how it is physica
 
I do not see how it is physically resonable for you to specify both pressure and total pressure, i.e. a complete specification of pressure and velocity at a sub-sonic inlet.

lvxiang March 16, 2005 21:15

it's Total Temperature and Pre
 
it's Total Temperature and Pressure , not pressure and total pressure

lvxiang March 16, 2005 21:25

it's Total Temperature and Pre
 
it's Total Temperature and Pressure , not pressure and total pressure

lvxiang March 16, 2005 21:38

sorry for post it twice, faile
 
sorry for post it twice, failed in canceling the post.
It prompt as this :
----------------
Sorry, but the message you were attempting to edit was posted more than 0 minutes ago. You are not permitted to edit messages more than 0 minutes old. If the message needs to be edited, contact a moderator, who can edit the message for you through the administration program.

Please contact Mattijs Janssens if this problem persists.
---------------

henry March 17, 2005 03:45

Sorry I missread your original
 
Sorry I missread your original post. We have not implemented a total temperature inlet boundary condition but it should be quite easy for you to do so. Take a look at the total pressure boundary condition implementation in OpenFOAM-1.1/src/OpenFOAM/fields/fvPatchFields/derivedFvPatchFields/totalPressur e and you will see what is necessary.

lvxiang March 18, 2005 00:10

I will try it ,thank you very
 
I will try it ,thank you very much.

hoangtt_ensma13 April 16, 2013 08:23

Hi Lvxiang, do you have somethings new in your problem? I am new also in CFD OpenFOAM


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