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October 22, 2021 at 12:36 pm
IA1996
SubscriberHow can i do an FSI analysis using a 2D model ?
I've tried to extrude the model to a 3D model and do a one element through thickness mesh , but any change in the thickness will lead to a change in the results .
What can I do ?
Thank you in advance
October 22, 2021 at 1:48 pmRob
Forum ModeratorWhy will it change the results?
October 22, 2021 at 4:09 pmIA1996
SubscriberFirst Thank you for your response .
The problem is the following :
I have a 2D model , I want to do a FSI analsysi ( which can't be done in 2D in ansys ) so i extrude the geometry to a 1mm thickness and i have a done a one element through thickness mesh , and I have done the fsi analsys .
After that , I want to check if method is good , so i have make an extrude about 10 mm , then when i have run the analysis the results of stress and deformation was changed .
The stress in the wall caused by the fluid has different value when i changed the thickness .
So the result have differ .
If there is any other solution to do the 2d fsi ?
Thank you .
October 22, 2021 at 6:31 pmIA1996
SubscriberThis is an example of what i have faced, these two simulation the first is with a 1 mm thickness and the second with 3 mm thickness. The Imported pressure differ between the two thickness , also the shear stress at walls in the Fluent results.
you can see the difference in the Equiv Stress Results with varying the thickness.
Thank you in Advance
October 23, 2021 at 4:50 pmAnanth Narayan
SubscriberDid the side face in your model contain one element in both cases?. Means- you need to set element size to 3mm in the second case because this will not form some kind of similarity I believe. Try doing this and share your results.
October 25, 2021 at 8:32 amOctober 25, 2021 at 9:55 amRob
Forum ModeratorCheck the pressure in Fluent. Reporting max values can be misleading if it's a tiny area that's affected. The resolution isn't that high either so you also need to review convergence and mesh resolution in Fluent.
November 4, 2021 at 8:01 amIA1996
SubscriberHello Thank you for your response.
I've tried to make better mesh , the results remain changing when I've tried a new thickness ( 0.1mm - 1mm - 5mm ).
The results in fluent concerning the static pressure and wall shear stress have changed with each thickness ,
Do we have a ratio of what thickness should we choose when doing FSI 2d ( one element through thickness ????
November 4, 2021 at 12:05 pmRob
Forum ModeratorCan you post some results? Without knowing what you're looking at it's impossible to give any guidance.
Viewing 8 reply threads- The topic ‘FSI with 2D’ is closed to new replies.
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