Learning Forum

[Shafaq]

Hi, I'm having trouble with Ansys Fluent. I have modelled a breakwater in an open channel flow. However the breakwater is not stopping the wave. I have attached a picture to show the problem 

[peteroznewman]

Build a bigger breakwater?

[Shafaq]

Thank you for your reply.  I have tried that, is there anything else I can try ?

 

[Rob]

How have you created the blockage? I ask as the free surface looks to ignore it, and as it ought to be a void (no mesh), that doesn't make sense. 

 

 

[Shafaq]

Hi yes, I have created the blockage, Do you know why the free surface is ignoring it ? 

[Rob]

Yes.

Please read up on Boolean Subtract. In isothermal models you only tend to model the fluid bit, you've got overlapping mesh and the box isn't doing anything other than confusing the results. 

[DrAmine]

Hi,

It might be that the blockage is ignored as you are initializing with the wave. Carry out the run and tell us what you are seeing.

 

 

[Shafaq]

Do you think its a problem initializing with the wave as it's not considering the blockage?

I'm unable to simulate the wave by creating a moving wall at the end of the tank as I've had complications with UDF  and I'm also using a university computer.

I've attached a picture after the run below 

 

[Rob]

Looking at that result, the wave has gone over the blockage and you need to check the back flow on the outlet to make sure the water can leave. The water-air interface also looks diffuse so you may also need to refine the mesh in that area.