simulation of free surface of stirred tank using vof
3 Attachment(s)
Hi alls,
I want to simulate free surface of stirred tank. I've solved my problem but it seems that results are wrong. System should be stable after a period of time, but did not stable. I think thak I don’t do a part of problem. What should I do that I have not done? Step by step of my problem: Read msh file 1) Make grid interfaces (rotor-stator interface) 2) Set multiphase model to VOF with default parameters 3) Set K-E with default parameters 4) Copy water-liquid from materials database 5) Define Air as primary phase 6) Define water as secondary phase 7) Operating condition: active gravity and set -9.81 to Z, (0 0 26.5) as reference pressure location 8) Boundary condition: A) Rotor fluid: whether moving mesh or mrf , 200rpm B) Rest fluid: stationary C) Impeller: stationary D) Shaft: absolute rotational, 200rpm E) Top of tank: symmetry F) Tank walls: no slip 10) initialize, init with default parameters 11) Adapt/ region/ (Xmin=-12, Xmax=12) (Ymin=-12, Ymac=12) (Zmin=0, Zmax=21.5)/ mark 12) initialize/ patch/ volume fraction of water in marked zone is set to 1 13) all parameters of solution is default of fluent 14) time step=0.001 or 0.0001 15) iterate |
pictures of your weird results?
|
Quote:
|
i would say interfaces issue -- are those spots exactly where interfaces-intersection are ?
|
Quote:
|
the four red you see on each picture...
|
Quote:
|
then here is the issue.
how many interfaces did you define? |
Quote:
http://www.cfd-online.com/Forums/ans...nk-gambit.html |
I would say 3:
*rotor perimeter *top cap of rotor *bottom cap of rotor No? Anyway are you dealing with moving mesh? if yes is it moving properly? |
Quote:
|
Quote:
Quote:
|
Quote:
Stator interface is defined similar to rotor:confused: |
Quote:
defined in gambit: top cap rotor as interface 1 top cap stator as interface 2 bottom cap rotor as interface 3 bottom cap stator as interface 4 perimeter rotor as interface 5 perimeter stator as interface 6 Then in fluent: grid interface A using interfaces 1 & 2 grid interface B using interfaces 3 & 4 grid interface C using interfaces 5 & 6 |
Quote:
I'll do the things you said and report the results to you |
Jamal,
also, if you use mrf you don't need any interface!Create interfaces, as explained by max, only if you use sliding mesh. If you use mrf you have only to define 2 fluid zones (rotor and stator), without interfaces. EDIT: "if you use mrf you don't need any interface!" --> if you have a conformal mesh |
Quote:
|
Quote:
Looking at the mesh model, I think it is quite simple to not create interfaces. Daniele |
Quote:
I agree..... Thats perfect |
Thanks all to your responses
|
All times are GMT -4. The time now is 00:29. |