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September 4, 2010, 17:22 |
SonicFoam simulation probleme
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#1 |
Member
Alex
Join Date: Mar 2010
Posts: 33
Rep Power: 16 |
Dear Foamers!
I'm trying to simulate the exhaust of a muzzle, my mesh and my boundary conditions are ok (transient boundary condition (time-depended) ), i'm using sonicFoam (with perfect gas). the simulation do not give any result (0 iteration all the time). You can find my case directory here http://www.4shared.com/file/hpAUp6tE/test64tar.html Any help please. Alex |
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September 5, 2010, 16:29 |
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#2 |
Retired Super Moderator
Bruno Santos
Join Date: Mar 2009
Location: Lisbon, Portugal
Posts: 10,980
Blog Entries: 45
Rep Power: 128 |
Hi Alex,
What version of OpenFOAM are you using and which gcc version did you use to build it? To know the gcc version, run: Code:
gcc -v Best regards, Bruno
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September 5, 2010, 16:35 |
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#3 |
Member
Alex
Join Date: Mar 2010
Posts: 33
Rep Power: 16 |
Hi Bruno,
I'm using OpenFoam 1.7.0 and gcc version 4.4.3. Best regards |
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September 5, 2010, 16:52 |
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#4 |
Retired Super Moderator
Bruno Santos
Join Date: Mar 2009
Location: Lisbon, Portugal
Posts: 10,980
Blog Entries: 45
Rep Power: 128 |
Hi Alex,
Well, that was easy... I didn't even need to run it. The problem is that you didn't notice that your write time is larger than your end time: Code:
endTime 0.00007 ; (...) writeInterval 0.0005; And yes, I've made this mistake too in the past Always keep in mind that with OpenFOAM (and probably other CFD applications too), you must handle input and output data with eagle eyes Otherwise, you might end up with a GIGO case (Garbage in - Garbage out). Best regards, Bruno
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September 5, 2010, 16:59 |
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#5 |
Member
Alex
Join Date: Mar 2010
Posts: 33
Rep Power: 16 |
Hi Bruno,
I've notice this error ans i modified it ndTime 0.007 ; (...) writeInterval 0.0005; But there is no change, all the simulation is with O iterations (p,e, Ux..) so the result is the same of my initials conditions. I let it working for 10 hours without any change. Any idea. Thanks a lot. |
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September 5, 2010, 19:14 |
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#6 |
Retired Super Moderator
Bruno Santos
Join Date: Mar 2009
Location: Lisbon, Portugal
Posts: 10,980
Blog Entries: 45
Rep Power: 128 |
Hi Alex,
Let me first just warn you: I have a lot of experience in installing OpenFOAM in Linux and Windows, but sadly I don't have much experience actually using it Nonetheless, I changed a bit the the times in the controlDict to: Code:
endTime 0.0007 ; deltaT 0.000008; writeControl runTime; writeInterval 0.0001; I can only assume two things from these two pictures:
My suggestion (as a pseudo-amateur) is to first test the mesh with icoFoam or simpleFoam, and see if the air can simply flow from one place to the other, without taking into account accuracy in turbulence and all that. Simply test the mesh if is a valid simulation domain. Best regards and good luck! Bruno
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September 5, 2010, 21:03 |
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#7 |
Member
Alex
Join Date: Mar 2010
Posts: 33
Rep Power: 16 |
Hi Bruno,
Thanks for your response. I had my mesh from a fluentMeshToFoam conversion, i've run the case under fluent and it gave a good result. Best regards. |
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October 30, 2010, 11:06 |
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#8 |
Member
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Hi bruxe
how about your simulations. explain me your problem which your are facing now. snd a private msg. regards Ambilpur Kiran |
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