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/*--------------------------------*- C++ -*----------------------------------*\ here is my dynamicMeshDict the only one which I am not sure is the restLength. I have 4 verticalSpring attached on the cylinder Best wishes, Scabbard |
Dear Scabbard,
many thanks. What about pointDisplacement file and motionU? |
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Do not need to put motionU in to the 0, MotionScale will be automatically generated. Best wishes, Scabbard |
In my case, I deleated pointDisplacement and pointMotionU, but it gives me this error message
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What does it mean? What's the problem? Regards |
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which version of OpenFoam are you using? Best wishes, Scabbard |
Dear Scabbard, I'm using OpenFOAM-2.2.2.
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Best wishes, Scabbard |
1 Attachment(s)
Dear Scabbard,
I attached you my case. With million of thanks. |
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Best wishes, Scabbard |
Dear Scabbard,
what mesh tools you used in your case? |
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ICEM is the tools which I use, because your polyMesh only have the boundary so I can not run the case Best wishes, Scabbard |
Dear Scabbard,
my running case is following these steps ./Allclean ./Allprepare pimpleDyMFoam |
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It is seems like I do not have the gmsh. Best wishes, Scabbard |
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no worries, I'll try to solve the problem. Best wishes Maimouna |
Naturally vibration of the circular cylinder
Dear OpenFOAM user,
I'm trying to let the cylinder moves in both x and y direction. I'm using for that OF230 and pimpleDyMFoam solver. It's moves in x direction itself and y direction itself. Now, I'm trying to keep it moves in x and y direction naturally at the same time. This is my dynamisMeshDict file Code:
/*--------------------------------*- C++ -*----------------------------------*\ Any answer would be welcomed? Thanks in advanced and regards. Maimouna |
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i did the oscillation on cylinder using OF 2.0.1 everything seems ok but i cant valid my result by comparing the lift coeffs. i've downloaded your case but you said it works on OF versions (2.2.2 and 2.3.0) so unfortunately i couldn't run your file and compare it. my problem is how to define measure of omega in ponitDisplacement file. according to the papers lock in occurs in 0.9<F<1.1 that F=f0/fs where f0 is the forced oscillation frequency and fs refers to the Strouhal frequency for the fixed cylinder. in my case Re=100 u=0.004016 d=0.025 St@Re100=0.165 so fs=0.0265 for F=1 f0=fs then omega is 2*pi*0.0265=0.166 is it right way or not? or problem is in my code? Thanks and Regards, alireza heidari. |
Dear Alireza,
what's the problem in my case? What's the error you get? Could you please send me your case to have a look? My email: may78may@hotmail.com. Kind regards |
Greetings to all!
@Maimouna: It's possible that you've stumbled upon a bug that was present in OpenFOAM 2.3.0 and that might have been already been fixed in 2.3.x. I'm referring to this bug report: http://www.openfoam.org/mantisbt/view.php?id=1284 You might want to try OpenFOAM 2.2.2, since on that bug report it states how a certain feature use to work in 2.2.2, but no longer worked in 2.3.0. In addition, have a look into the tutorial "mesh/moveDynamicMesh/simpleHarmonicMotion" in 2.2.2. It's a very simple tutorial and it makes it a lot easier to test the parameters for restraints, stiffness and so on. The difference is that this motion is based on gravity+springs only and controlled in the file "0/pointDisplacement". This tutorial is no longer present in OpenFOAM 2.3... or at least I can't find it :( ... then again, it might be this tutorial: "multiphase/potentialFreeSurfaceDyMFoam/oscillatingBox" - although it's not controlled in the same way :( Best regards, Bruno |
Dear Bruno,
lots of thanks for your post. Regarding what you posted #58, I swiched my case from OF-2.3.0 to OF-2.2.2. My pointDisplacement file is Code:
/*--------------------------------*- C++ -*----------------------------------*\ Code:
/*--------------------------------*- C++ -*----------------------------------*\ Thanks and regards. Maimouna |
1 Attachment(s)
Hi Maimouna,
I'll write this post as a diary of my progress while examining your files and the case at hand. I'm using the case from post #48 as a base, then replaced the files you indicated in the post above. I used OpenFOAM 2.2.x, but should also with 2.2.2... at least I hope so.
Run the attached case to get a feeling of how my thinking in trying to isolate-and-conquer each setting, one at a time. Then start from this case to do small changes. First gradually change and test the "horizontalSpring" parameters to suit your case. Then try adding back the "verticalSpring". Then reduce the inlet speed from 100 to 10 and later to 1. Always run in between changes, to see the results. This way you'll slowly but steadily find how to properly configure your case. Only when things seem to be working properly, should you start turning on the additional features, such as the functions objects and the long run times. Best regards, Bruno |
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