We’re putting the final touches on our new badges platform. Badge issuance remains temporarily paused, but all completions are being recorded and will be fulfilled once the platform is live. Thank you for your patience.
Fluids

Fluids

Topics related to Fluent, CFX, Turbogrid and more.

FSI with 2D

    • IA1996
      Subscriber

      How 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

    • Rob
      Forum Moderator
      Why will it change the results?
    • IA1996
      Subscriber
      First 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 .
    • IA1996
      Subscriber
      This 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
    • Ananth Narayan
      Subscriber
      Did 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.
    • IA1996
      Subscriber
      Hello , Thank you for your response.
      Yes I already did that ( the element in the thickness for the second case is 3mm ).
      I've shared the results in the thickness for the two cases . You can see the imported load how it's differ also.
    • Rob
      Forum Moderator
      Check 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.
    • IA1996
      Subscriber
      Hello 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 ????
    • Rob
      Forum Moderator
      Can 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.