Fluent: How to generate sinusoidal inlet waves with bathymetry (VOF)

[rithanya.rajeshkhannan]

Hello everyone,

 

I am currently working on a CFD simulation in ANSYS Fluent with the following setup:

• Geometry: a channel with a bathymetry (similar to a wave flume)

• Goal: generate surface waves at the inlet

• Model: VOF to capture the free surface

 

My first step is to generate a simple sinusoidal wave at the inlet. However, I do not want to use a moving wave flap, since that is too computationally expensive.

 

The issue: In Fluent, the Wave Height and Wave Length inputs at the velocity inlet do not accept time-dependent variables. I also checked with UDFs, but it seems they cannot be directly used to make these fields time-dependent either.

 

Is there a way to prescribe a time-dependent sinusoidal inlet boundary condition in Fluent?

Has anyone implemented an efficient approach to generate realistic sinusoidal waves at the inlet without a wave flap?

 

Any advice or experience would be greatly appreciated!

 

Best regards,

Rithanya

[Rob]

 

If you turn on the open channel options you should be able to set height and speed as a function of time. 

Alternatively there are various wave models in the code.