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-   -   Dynamic Mesh issue (http://www.cfd-online.com/Forums/fluent/98219-dynamic-mesh-issue.html)

sheth March 6, 2012 07:25

Dynamic Mesh issue
 
Hi all!

I am simulating airfoil plunging at some angle of attak as shown in schematic dia below.

http://www.freeimagehosting.net/t/hx1jn.jpg

But the solver gives motion as shown in this image no 2:

http://www.freeimagehosting.net/t/vl6qz.jpg

My udf consist , omega[0]= -30*dtr*omegat*cos(time*omegat).

What is the solution for this issue.

Thanks in advance.

Rhyno466 March 6, 2012 12:14

I am doing something similar myself. When using the omega[] function, the motion you are prescribing is rotational. This will always produce an arc type motion about the CG you prescribed while setting up the the dynamic mesh options. Also, you should be careful about what axis you want this rotation to be about as defined by the [].

sheth March 7, 2012 02:34

Quote:

Originally Posted by Rhyno466 (Post 347935)
I am doing something similar myself. When using the omega[] function, the motion you are prescribing is rotational. This will always produce an arc type motion about the CG you prescribed while setting up the the dynamic mesh options. Also, you should be careful about what axis you want this rotation to be about as defined by the [].

But cant I set the arc type motion about axis perpendicular to my geometry and not about the global co-ordinate axis ?


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