Learning Forum

[Adolfo Mendoza Ambrocio]

Hello ANSYS community,

I would like to know if it is possible to simulate an object vibrating within a fluid or impose a vibration as a boundary condition. If so, what is the recommended approach?

My goal is to study the behavior of the fluid, and if this is feasible.
I would appreciate any guidance or recommendations you can provide.

Thank you.

[Kalyan Goparaju]

Hello, 

Ansys Fluent allows you to specify spatially and temporally varying boundary conditions, using Expressions or UDF's, using which you can simulate a vibration boundary condition. If you want to include the solid in the simulation and if it is rigid, you can use the "Six-DOF" option in the "Dynamic Mesh" tab of Ansys Fluent.  If the motion is restricted to a particular direction, like in vibration, you can constraint the 6-DOF using the properties panel or a UDF. 

Best, 

Kalyan

[emrehangursoy]

Hello,

I want to investigate the heat transfer effect of ultrasonic vibration. For this purpose, I have formed a basic fluid domain like smooth tube with L=500 mm (3D). I want to apply ultrasonic vibration on the middle section of this domain and I splitted the surface with the help of face split tool. After that, I have meshed fluid domain, clasically.

 

After that, I have formed a UDF code for solve the ultrasonic vibration in ANSYS Fluent. In this point, I have a question to you. How I identfy the UDF code as a boundary condition for fluid domain wall? Also, is it required using the dynamic mesh althoug there is no any solid?

Thank you for information.

Best regards.