Learning Forum

[Mehm.Sabr.27]

I have a rigid body- cylinder tube with two holes which use as inlets, and the flow needs to enter in 1 sec into the domain by using the holes and the flow needs to be exit by the same hole in the 2nd second. In my opinion, I need to generate UDF. However, when I named the sections in meshing as inlets, walls. it gives me an error due to named selection. From my understanding th inlets and outlets need to be defined as different surface. If you have any idea, could you please explain? Thanks.

 

[Rob]

Please can you show an image? What causes the flow to enter and then leave?

[NickFL]

I am a bit confused on what you have here, so let me explain what I think you have. This is a transient simulation, correct? There is a cylinder with two inlets with fluid entering both of the inlets (is there an outlet?) for the first second. At time t=1[s], one (or both) of the inlets have no fluid entering and can be outlets. Is this correct? Just so you know it you will likely need small timesteps when you jump between configurations.

The names you create in Meshing using Named Selection are not important. You can name them hole-1 and hole-2 if you want. It is not until we are in Fluent when we have to define that they are inlet or walls or whatever. That is why you cannot give those cell faces multiple names and you get the error message.

[Mehm.Sabr.27]

I attached the link for photos. Vessel have 2 holes and it is the trasient flow simulation. Main idea is that air flow goes inside through these two holes in the first second, then airflow release in the following time 1-2 second and exits by the same holes. I am trying to figure out how to do? If have any idea, please let me know. Thanks

 https://drive.google.com/drive/folders/1KjBsrwiEYc8rrk856pMtrWlZNPPfZtL5