water sloshing in oscillating tank (problem using udf Define_ZONE_MOTION)
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 waterair 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 timestep 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? 
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. 
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. 
You said it first! I was just going to suggest that. So is everything fine now?

Yup!! everything is great! :)

sloshing
Quote:

Sumit,
Can you please let me know how to go about solving this problem Thanks,Samwize 
All times are GMT 4. The time now is 22:16. 