[Other] Modify mesh runtime

Daniele111 · June 21, 2010, 08:02

Hi
I'm simulating a evolutive case. My initial domain is a rectangle 2d and the shape of the bottom is a gaussian. At each temporal step the bottom modify its shape, How can I modify the mesh quickly at each time step?

Thanks

deepsterblue · June 21, 2010, 09:11

Simple. Use the mesh-motion solver to move points at each time step. Take a look at icoDyMFoam and its multiple variants.

Daniele111 · June 21, 2010, 09:54

thanks
Uhm the coordinates of new point are calculated with matlab. I can use icoDyMFoam?

deepsterblue · June 21, 2010, 09:59

I don't see why not. I would write a function in C++ that replicates the matlab code to define boundary point-positions, and pass that into the mesh-motion solver to let it deal with internal ones. There's a ton of code-snippets in the forum that deal with this situation.

Daniele111 · June 21, 2010, 19:37

I can use it with simpleFoam?

Daniele111 · June 21, 2010, 19:55

I don't understand well how work it. In my problem matlab simulate a process and inside it (for cycle) I call OpenFoam to calculate shear stress, the new shape of the bottom is result of matlab script, I would modify old vertex mesh into the new one, and recalculate the new shear stress with openfoam etc...

Daniele111 · October 11, 2010, 04:29

hi
I'm using simpleFoam for my simulation couple with a matlab script. I do a simulation with openfoam and I use its result for matlab script that update the geometry. How can I modify my mesh without remeshing to start a new simulation? I use a fluent mesh. It is a evolutive simulation coupled with matlab, and during the simulation change only the bottom shape.

Thanks

shajitah · October 12, 2010, 14:18

Dear Daniele,

As far as I've realized, you've written a script in Linux which calls OpenFOAM. I'm gonna do a similar job. Actually, I'm supposed to write an algorithm in C++ or Matlab which one part of it deals with CFD calculations in which it needs to call OpenFOAM. I was wondering if you could please provide me a sample code/script (in any language) which calls OpenFOAM or a tutorial which might help me sort out the way of calling OpenFOAM.

Cheers,
Sina

Daniele111 · December 19, 2010, 15:43

Hi
What kind of command i must use to update my geometry. My situation is this:
1) Matlab script -> new bottom geometry
2) Update OpenFoam mesh with new bottom
3)OpenFoam simulation-> result go to matlab
loop

So Can i update OpenFoam mesh? Matlab script give me new vertex position of the mesh bottom.
Help me!

Daniele

June 21, 2010, 08:02	Modify mesh runtime	#1
Daniele111 Senior Member Daniele Join Date: Feb 2010 Posts: 134 Rep Power: 16	Hi I'm simulating a evolutive case. My initial domain is a rectangle 2d and the shape of the bottom is a gaussian. At each temporal step the bottom modify its shape, How can I modify the mesh quickly at each time step? Thanks

June 21, 2010, 09:11		#2
deepsterblue Senior Member Sandeep Menon Join Date: Mar 2009 Location: Amherst, MA Posts: 403 Rep Power: 25	Simple. Use the mesh-motion solver to move points at each time step. Take a look at icoDyMFoam and its multiple variants. __________________ Sandeep Menon University of Massachusetts Amherst https://github.com/smenon

June 21, 2010, 09:59		#4
deepsterblue Senior Member Sandeep Menon Join Date: Mar 2009 Location: Amherst, MA Posts: 403 Rep Power: 25	I don't see why not. I would write a function in C++ that replicates the matlab code to define boundary point-positions, and pass that into the mesh-motion solver to let it deal with internal ones. There's a ton of code-snippets in the forum that deal with this situation. __________________ Sandeep Menon University of Massachusetts Amherst https://github.com/smenon

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June 21, 2010, 09:54		#3
Daniele111 Senior Member Daniele Join Date: Feb 2010 Posts: 134 Rep Power: 16	thanks Uhm the coordinates of new point are calculated with matlab. I can use icoDyMFoam?

June 21, 2010, 19:37		#5
Daniele111 Senior Member Daniele Join Date: Feb 2010 Posts: 134 Rep Power: 16	I can use it with simpleFoam?

June 21, 2010, 19:55		#6
Daniele111 Senior Member Daniele Join Date: Feb 2010 Posts: 134 Rep Power: 16	I don't understand well how work it. In my problem matlab simulate a process and inside it (for cycle) I call OpenFoam to calculate shear stress, the new shape of the bottom is result of matlab script, I would modify old vertex mesh into the new one, and recalculate the new shear stress with openfoam etc...

October 11, 2010, 04:29		#7
Daniele111 Senior Member Daniele Join Date: Feb 2010 Posts: 134 Rep Power: 16	hi I'm using simpleFoam for my simulation couple with a matlab script. I do a simulation with openfoam and I use its result for matlab script that update the geometry. How can I modify my mesh without remeshing to start a new simulation? I use a fluent mesh. It is a evolutive simulation coupled with matlab, and during the simulation change only the bottom shape. Thanks

October 12, 2010, 14:18		#8
shajitah New Member Sina Join Date: May 2010 Posts: 7 Rep Power: 15	Dear Daniele, As far as I've realized, you've written a script in Linux which calls OpenFOAM. I'm gonna do a similar job. Actually, I'm supposed to write an algorithm in C++ or Matlab which one part of it deals with CFD calculations in which it needs to call OpenFOAM. I was wondering if you could please provide me a sample code/script (in any language) which calls OpenFOAM or a tutorial which might help me sort out the way of calling OpenFOAM. Cheers, Sina

December 19, 2010, 15:43		#9
Daniele111 Senior Member Daniele Join Date: Feb 2010 Posts: 134 Rep Power: 16	Hi What kind of command i must use to update my geometry. My situation is this: 1) Matlab script -> new bottom geometry 2) Update OpenFoam mesh with new bottom 3)OpenFoam simulation-> result go to matlab loop So Can i update OpenFoam mesh? Matlab script give me new vertex position of the mesh bottom. Help me! Daniele