Arbitrary Lagrange Euler regarding FSI

thda7 · May 19, 2014, 08:03

Hello folks,

I am currently writing my master thesis about FSI. I faced a lot of articles about ALE-formulation, which I want to describe.

Actually my problem is, that I don't understand where I can find the ALE-mesh regarding my fluid and solid structure. Are both meshes formulated in ALE description? If so, why do I descretize a solid and a fluid mesh independently in practice? Does that mean that the mesh will be regenerated to an ALE-mesh once deformations appear?

Do we need any interpolation at the interface then?

Thanks in advance for every helpful remark.

Thomas

tas38 · May 21, 2014, 12:26

The ALE formulation only applies to the fluid domain. The solid domain is Lagrangian. If the nodal locations at the fluid/solid interface do not coincide, some means of interpolation will be necessary to transfer pressure and surface tractions from fluid to solid and transfer mesh nodal displacements from solid to fluid.

thda7 · May 21, 2014, 15:31

Thank you tas38. How do I know if nodal locations coincide? On what does it depend? Is it controllable by the user?

May 19, 2014, 08:03	Arbitrary Lagrange Euler regarding FSI	#1
thda7 New Member Thomas Join Date: Jul 2012 Posts: 8 Rep Power: 13	Hello folks, I am currently writing my master thesis about FSI. I faced a lot of articles about ALE-formulation, which I want to describe. Actually my problem is, that I don't understand where I can find the ALE-mesh regarding my fluid and solid structure. Are both meshes formulated in ALE description? If so, why do I descretize a solid and a fluid mesh independently in practice? Does that mean that the mesh will be regenerated to an ALE-mesh once deformations appear? Do we need any interpolation at the interface then? Thanks in advance for every helpful remark. Thomas

May 21, 2014, 15:31		#3
thda7 New Member Thomas Join Date: Jul 2012 Posts: 8 Rep Power: 13	Thank you tas38. How do I know if nodal locations coincide? On what does it depend? Is it controllable by the user? Last edited by thda7; May 22, 2014 at 03:41.

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May 21, 2014, 12:26		#2
tas38 Senior Member Troy Snyder Join Date: Jul 2009 Location: Akron, OH Posts: 219 Rep Power: 18	The ALE formulation only applies to the fluid domain. The solid domain is Lagrangian. If the nodal locations at the fluid/solid interface do not coincide, some means of interpolation will be necessary to transfer pressure and surface tractions from fluid to solid and transfer mesh nodal displacements from solid to fluid.