Learning Forum

[tjupt8166]

Hello,

I am currently using Ansys Transient and Fluent to try to simulate the fluid flow when there is structural deformation, which I think should be one-way FSI. However, I could not find the correct settings or layout to do this but only found some materials showing transfer data from Fluid to Mechanical. Could anyone help or give a hint?

Below is the transient structural calculation I have, I need External Data as the transient load, and then calculate the transient deformation.

[Karthik Remella]

Hello You can use the System Coupling for this. There are several videos on YouTube that explain the model setup (hint - search "1 way FSi ansys"). Please have a look at these and you should be able to move forward with your analysis.
Karthik

[tjupt8166]

Thanks, Kremella.
I did watched some videos on Youtube, and I found most are Fluid to Mechanical. What I am trying to do is transferring data from Transient Sturctural to Fluid calculation, 1-way. Could you recommend anything about this application? By using System coupling (I thought it is only for 2-way), could we just transfer data from Mechanical to Fluid?
Many thanks Yuesen

[Rob]

If you're wanting to transfer the deformed shape I think you can write out the mesh at the end of the Mechanical solution. You then need to remesh this for use in Fluent.

[tjupt8166]

Hi Rob, exactly. I want to introduce the deformed surface (transient) onto a counterpart surface the fluid calculation. May I ask how to write the mesh out for all the timesteps?
Very much appreciated Yuesen

[Rob]

That'll need someone with Mechanical knowledge: ie or You then need to decide how to use that deformation in Fluent: read the moving deforming mesh sections of the manual.

[tjupt8166]

Thanks, Rob. I will read the section, and probably UDF is needed?
and could you please let me know how to write the transient results out and then feed them into the Fluent part? Many thanks.

[Stephen Orlando]

There are two options.
Using a UDF to define the deformation of the mesh in Fluent.
Run a 1-way coupled simulation using System Coupling. Displacements are sent from Transient Structural to Fluent at every timestep and there is no data transfer of surface pressure from Fluent to Transient Structural. The displacement is defined in Mechanical either with a Remote Displacement, Force, Pressure etc.. You can use the following tutorial as a reference. This is a 2-way simulation but you can remove the Fluent to Transient Structural data transfer in the System Coupling setup. In this example, a Force is applied to the plate to deform it initially. https://ansyshelp.ansys.com/account/secured?returnurl=/Views/Secured/corp/v202/en/sysc_tut/sysc_tut_oscplate_wb_fluent.html
Steve

[tjupt8166]

Thank you, Steve. I am actually trying the second option now.
Many thanks to everyone, you are awesome!