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Starting pimpleFoam computation from simpleFoam result |
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November 26, 2012, 04:25 |
Starting pimpleFoam computation from simpleFoam result
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#1 |
Senior Member
Vincent RIVOLA
Join Date: Mar 2009
Location: France
Posts: 283
Rep Power: 18 |
Dear all
Here is what I am doing. I did a first computation using simpleFoam on a "empty" shape that you can see in the picture below. Up to that point everything is fine and results look good. My goal is to place a valve on the right part of the shape with an overpressure inside. To do that I created a new mesh, I chose a pressure of 500 Pa in all the field and then I used mapFields with the precedent result. This way, the pressure is equal to 500 inside the shape and is equal to the previous result everywhere else. (See picture below). Then I want to start my computation with pimpleFoam with still the same wind coming from the right (4m/s) in order to see if my over pressure actually decreases through the valve and what the flow looks like in this part. My problem here is that at the first time step the pressure in the shape becomes quickly equal to the "stagnation" pressure I found in my previous computation. Without really creating any flow through the valve. Even for low timeSteps, the behavior does not look correct. I already ran some computations with non uniform initial flow field using rhoPimpleFoam with quite good results but with this case I don't manage to get what I want. I have to add that my computation is axisymmetric. Does anyone have an idea on this ? Vincent Last edited by vinz; November 29, 2012 at 06:00. |
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November 29, 2012, 05:13 |
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#2 |
Senior Member
Vincent RIVOLA
Join Date: Mar 2009
Location: France
Posts: 283
Rep Power: 18 |
any idea on what's going on?
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November 29, 2012, 05:27 |
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#3 |
Member
Michiel
Join Date: Oct 2010
Location: Delft, Netherlands
Posts: 97
Rep Power: 15 |
The images are not visible. Could you post them through the image include of the forum?!
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November 29, 2012, 05:45 |
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#4 |
Senior Member
Vincent RIVOLA
Join Date: Mar 2009
Location: France
Posts: 283
Rep Power: 18 |
Thank you for pointing that out.
It is actually very strange since I can see the image on linux but not on my Mac. Here are the links toward images, and as you can see I have use the forum attachment tool since they are hosted on CFD-online: http://www.cfd-online.com/Forums/att...1&d=1353921281 http://www.cfd-online.com/Forums/att...1&d=1353921472 http://www.cfd-online.com/Forums/att...1&d=1353921481 |
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November 29, 2012, 05:52 |
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#5 | |
Member
Michiel
Join Date: Oct 2010
Location: Delft, Netherlands
Posts: 97
Rep Power: 15 |
Quote:
Do you have any external place to put them so I can look at them there? |
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November 29, 2012, 05:58 |
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#6 |
Senior Member
Vincent RIVOLA
Join Date: Mar 2009
Location: France
Posts: 283
Rep Power: 18 |
let's try it for the last time.
Now normally it should be even visible on the first message. |
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November 29, 2012, 09:04 |
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#7 |
Member
Michiel
Join Date: Oct 2010
Location: Delft, Netherlands
Posts: 97
Rep Power: 15 |
Yes, now I can see the images.
I'm not sure why this would happen. What boundary conditions do you have on the valve walls?! |
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November 29, 2012, 09:21 |
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#8 |
Senior Member
Vincent RIVOLA
Join Date: Mar 2009
Location: France
Posts: 283
Rep Power: 18 |
I treat them as no slip walls.
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December 10, 2012, 02:18 |
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#9 |
Senior Member
Vincent RIVOLA
Join Date: Mar 2009
Location: France
Posts: 283
Rep Power: 18 |
I am really stuck with this.
Does anyone have any idea? |
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March 17, 2014, 12:35 |
Initialize pimpleFoam from simpleFoam solution
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#10 | |
Member
Join Date: Feb 2014
Posts: 57
Rep Power: 12 |
Dear VINZ,
Your post interested me. I am new Foamer with little experience and I am searching for initializing a LES simulation using pimpleFoam from a solution of simpleFoam. That's would be great if you can give me some details and steps to follow. Thank you in advance, VUT Quote:
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