Hello Everyone,
I am trying to setup Volume of Fluid simulation in Fluent to study the droplet interaction with the wall under the influence of gravity.
The domain is a rectangular 2 D body representing the duct with air inlet from the left side and a separate zone of droplet.
Now, what I have learn about VOF is that it calculates interface and I should not assign any interface between droplet zone and air zone. But the only options I get in fluent is either to model as interface or model as wall.
Also, in order to study whether a droplet will bounce, stick or splash while hitting the bottom wall, what boundary condition should I use.
I tried running for a fine mesh and with a very small del_t but the solver still crashed.
The boundary conditions I used were
Inlet: Velocity inlet. ( Left face)
Outlet: Pressure Outlet
Top and Bottom Wall as wall.
Hi Chirag,
thanks for your reply.
I have attached an image with this comment which shows my model setup in details.
I did setup using these steps only before, but there is some issues.
After end of each time step, the continuity residuals shoots up to a very high values (1e9) and then after few time steps , it eventually crashes.
The mesh is pretty decent with minimum orthogonality as 0.65.
Also I tried reducing the time step and it didnt work out.
I must be doing something wrong.
I went through the links you shared and it looks very interesting.
which software is that and I believe your droplet is hitting a pool of similar material ?
Thanks again.
And is it possible to share the case and data files of your case run.
Looking forward to hear from your side soon.
Hey Chirag,
I am using Fluent and I will make structured mesh for this domain ( I was using unstructured triangular mesh ).
Time step was 0.0005 s and let me try again with changed urfs to see if I can achieve convergence.
Also, is there a way to convert the boundary (edge) between droplet and air at t=0 into interior. I read somewhere that for this setup , the edge should be treated as interior zone and that makes sense as well.
Hi Chirag ,
I have shared the case files
Please go through it
https://drive.google.com/file/d/0B2zqILhKX1cLWGlDV1Z3N3RlRWM/view?usp=sharing
And I really appreciate your help.
Thanks a lot
Regards
Shashank Mishra
hahaha, thanks for your comment and help and everything.
It did work, but the water spread on the wall at the end instead of splashing.
Now I know that splashing depends on the momentum but this droplet has enough momentum to simulate splashing.
I am sorry, I am new to multiphase and VOF and I might be missing something very basic, but I will drink beer once I am able to simulate what guys in the paper I attached did.
But I really appreciate you helping me out and if you can just gaze through the paper and if you find it interesting , can you advise me how to set up that.
Is modelling heat transfer with VOF such a difficult task
hello
have you succeeded in doing the simulations for "set up Volume of Fluid Simulation for a falling droplet"?
i need help.
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