March 9, 2021 at 7:41 pmvbb96vbbSubscriberMarch 11, 2021 at 2:54 pmKarthik RAdministratorHello,nInstead of attaching videos, could you post some screenshots or embed a gif into your post? Ansys employees are not able to download attachments from the forum.nAlso, are you running a transient structural analysis in this problem? I just want to confirm if there is not Fluid flow involved at this time. Please let me know.nKarthiknMarch 14, 2021 at 4:28 amMarch 17, 2021 at 12:09 pmKarthik RAdministratorHello,nLet me check on this with a Mechanical expert and get back to you.nKarthiknMarch 17, 2021 at 1:20 pmAshish KhemkaAnsys EmployeennHow is the fluid connected to the pole? I do not see any contact between flag and pole.nnRegards,nAshish KhemkanMarch 17, 2021 at 5:56 pmvbb96vbbSubscriberThank you - there is no established contact but that side of the flag (fabric) is fixed... so the pole is a representation: but idle.nI am only focused on the flag (materials); Intending to make it drop under gravity.nnMarch 17, 2021 at 5:57 pmvbb96vbbSubscriberThank you so much nI am looking forward to hearing from you soon.nMarch 18, 2021 at 12:06 pmKarthik RAdministratorHi,nSince I'm don't have a deep knowledge of structural mechanics, is going to be helping you with this one.nKarthiknMarch 18, 2021 at 12:43 pmAshish KhemkaAnsys EmployeennI think you have defined the Elastomer Sample model for the cloth. Do you think that the fabric of Young's modulus of ~ 1342 MPa? Also, how is the flag deforming when applying standard earth gravity? Can you please share a snapshot of the same?.Regards,nAshish KhemkanMarch 19, 2021 at 2:34 amvbb96vbbSubscriberThank youMarch 19, 2021 at 4:36 pmvbb96vbbSubscriberThank you nYes, I did define the material model appropriately and I will share some reference extract.nnBurnett, B . Coupled fluid-structure interaction modeling of a parafoil. PhD Dissertations and Master’s Theses, 2016, p. 74nnYes, I think that the fabric of Young's modulus of ~ 1342 MPa, and please kindly find attached the imagery from a work.n nAccardo, Giampiero & Eugeni, Marco & Mastroddi, Franco & Romano, Giovanni. (2013). Experimental and numerical modelling for flag flutter. pg. 9nnAnd - this is the deformation of the fabric under gravity.nnMarch 24, 2021 at 7:55 pmvbb96vbbSubscriberplease I wanted to follow up to know if there is any update thanksnMarch 25, 2021 at 4:07 amMarch 25, 2021 at 4:16 amvbb96vbbSubscriberThank you for the response, your time, and the information.nnYes, correct - I need the flag to be at rest at the Imaged position, under gravity.nIf I can't use elastomer as the material, please what can I change it to in order to get successful at this?.Thank you so much. nMarch 25, 2021 at 4:26 amAshish KhemkaAnsys EmployeennI think composites can be used to model fabric but I have limited knowledge on the same. I will check if someone can comment on the use of composites.nnRegards,nAshish Khemka nMarch 25, 2021 at 4:31 amvbb96vbbSubscriberThank you nMarch 25, 2021 at 8:27 pmMike RifeAnsys EmployeeHi @vbb96vbb nYou have run into a classic issue with Finite Element models being too perfect. The flag is modeled as a perfectly flat surface with gravity acting in the plane of the surface. Our instincts are to expect the FEA result to show the flag droop, since that is our real-world experience. But in the real world the flag is not perfectly flat. There are really ripples in the fabric. nTo overcome this try a static-linear buckling-transient linked system approach like so:n" target='blank'>nAnyway you will need to drag-and-drop the Engineering data and the Solution of the Buckling to the Transient Model cell manually. Set up the Static case as you already have: with the flag fixed on the left side, and apply gravity (-Y). When the solve is done change the buckling to find say 10 modes. Then pick one that kind of looks like a fluttering flag. If none suite your needs try solving for more modes. Note the scale factor on the results used so we can see the displacements. From the Mechanical Help -> Application Interface -> Ribbon -> Context Tabs; Result Context Tab we can see this image (scale factor here):nMarch 26, 2021 at 6:26 pmMike RifeAnsys EmployeeDrag and drop the whole Eigenvalue buckling onto the Solution cell of the Static structural system. MikenMarch 26, 2021 at 6:33 pmViewing 22 reply threads
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