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-   -   Jet simulation (http://www.cfd-online.com/Forums/openfoam/71044-jet-simulation.html)

JackNapier December 13, 2009 19:57

Jet simulation
 
Hi,

I'm a newbie of OF, but I'm trying to learn how to handle it.
I'd like to simulate a typical fluid dynamic case, i.e. an axisymmetric jet-flow in an open space.

Is there someone who can help me?

Thanks in advance

Michele

markusrehm December 14, 2009 03:38

Hello,

have a look at makeAxialMesh for conversion into wedgy-type mesh

http://openfoamwiki.net/index.php/Contrib_MakeAxialMesh

and in
run/lesInterFoam/nozzleFlow2D
there is also an example of a blockMesh grid.

Hope that helps, regards, Markus.

JackNapier December 14, 2009 07:25

Hi Markus,

thank you very much for your quick replay.
I took a look at the tutorial you suggested me for the solver (interFoam): i think it is too advanced for my present knowledge,so can you help me?
Furthermore the case I'd like to simulate is easier I guess: in fact I want only to reproduce an air jet entering a not-bounded atmosphere where air is in rest.
If you could help me, I'd appreciate very much.

Thank you,

Michele

markusrehm December 15, 2009 03:25

Hi Jack,

maybe turbFoam (transient) or simpleFoam (steady state) would be appropriate for you. But I wanted to tell you that the mesh is axisymmetric as you wanted.

Regards, Markus.

hamcer February 18, 2010 13:38

Jet simulation
 
I'm doing a numerical calculation of an injector by simplefoam solver, geometry is now axisymmetric (upperwall represents an area of torpido, interWall that of the outer surface of the jet type slip to see the behavior of velocity Uy, but I have two bad results:
1 - the Massflow is not constant when I apply CalcMasseFlow between inlet and outlet
2 - I have a pressure not stable
I spend a lot of time to make changes in my geometry and methods of calculation but I have not been successful;
click on this link to download my case.
http://www.sendspace.com/file/6nmw8l

If you have any ideas they are welcome.
Regards.


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