Learning Forum

[haibo]

I encounter a problem in my FEM frid independence study using the Transient Structure, when I set the mesh type to SOLID185 by default, I can get the grid independent solution, but when I use the ET command to set the mesh element to SOLID226 for a fluid-structure interaction analysis, I can't get the grid independent solution, and I actually need to reduce the mesh size many times to get a convergent grid independent solution. However, it is obviously irrational and inefficient for FEM analysis.

[Lydia]

Hello,

Why would you like to use solid226 for your Fluid and Structure Interaction analysis?

If you check this doc link https://ansyshelp.ansys.com/account/secured?returnurl=/Views/Secured/corp/v241/en/ans_elem/Hlp_E_SOLID226.html?q=solid226 this element is used to couple structural with thermal/electric analysis. It is not used for coupling structures with fluids. 

[haibo]

I find in the Workbench Help that if KEYOPT(1) is set to 1, solid226 only has three degrees of freedom for the displacement of the structure. Could SOLID226 only be used for coupled analyse that includes thermal/electric ?

[Erik Kostson]

 

Hi

Yes, since they are coupled field, they are to be used for that (not single physics). Does not have to be only thermal electric, can be also str-thermal so keopt(1) = 11,piezoelectric, etc (there is no fluid flow degree of freedom in them so there is no fluid-str. fsi inbuilt solution using them).

See the help manual for more info on these elements.

 

[haibo]

Thank you very much for your answer.