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water sloshing in oscillating tank (problem using udf Define_ZONE_MOTION) |
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#1 |
New Member
Sumit Tambe
Join Date: Feb 2013
Posts: 8
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hello everyone,
I am simulating 2D sloshing of water due to oscillatory motion of a square tank. Here is a small description: model=VOF: Implict, with zonal discretization. gravity in 'y' dirctn. Tank: 0.2m x 0.2m sqaure tank, closed walls. Mesh: structured, finer at the water-air interface. filled depth: 0.04m UDF: #include <udf.h> DEFINE_ZONE_MOTION(fmotion,omega,axis,origin,veloc ity,time,dtime) { real velocity={0.6282*sin(62.82*time),0.0,0.0}; return; } UDF is hooked up with both of the cell zones. Walls: moving walls, with relative velocity(adjacent to cell zone) =0 m/s time-step size=0.0001 s during calculation x and y velocity residuals are remaining almost constant until I reduce momentum URF to 0.001, then after the solution rapidly converges. But water remains stationary as before. The free surface orientation does not change with time. even after 1 second of flow time. Can anybody help me out? |
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#2 |
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Paritosh Vasava
Join Date: Oct 2012
Location: Lappeenranta, Finland
Posts: 732
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1. Is there a space in 'DEFINE_ZONE_MOTION(fmotion,omega,axis,origin,veloc ity,time,dtime)' or just a typo?
2. It is possible that 1 sec is too short time to notice sloshing, try bit longer simulation. Last edited by vasava; April 2, 2013 at 08:20. |
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#3 | |
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Sumit Tambe
Join Date: Feb 2013
Posts: 8
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Quote:
Time is surely not an issue. Instead of trying with a moving mesh, I varied a body force. Its giving good results even for small simulation time. Just that you wont see the mesh moving. but Its fairly sufficient for the analysis. |
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#4 |
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Paritosh Vasava
Join Date: Oct 2012
Location: Lappeenranta, Finland
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You said it first! I was just going to suggest that. So is everything fine now?
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#5 |
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Sumit Tambe
Join Date: Feb 2013
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Yup!! everything is great!
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#6 | |
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Puneet
Join Date: Sep 2013
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Quote:
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#7 |
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Join Date: May 2014
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Sumit,
Can you please let me know how to go about solving this problem Thanks,Samwize |
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#8 | |
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venu madhav
Join Date: Apr 2017
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Quote:
How did you use an oscillating body force in FLUENT? Did you use UDF or is there a better way to do so? Thanks, Venu |
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#9 |
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Alexander
Join Date: Apr 2013
Posts: 2,363
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to apply gravity you may use momentum source term
to make it transient you may use transient profile or UDF and may be expression now (which should be checked)
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Tags |
define_zone_motion, lateral excitation, sloshing, udf |
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