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February 20, 2017, 16:45 |
VOF Grid Independence Test
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#1 |
New Member
Sajjan Pokhrel
Join Date: Jun 2016
Location: Ohio, USA
Posts: 4
Rep Power: 10 |
Hello Everyone,
I am simulating a newly developed cross-flow water turbine using VOF and MRF models (three dimensional). My concern is a power output from turbine. I calculated power which I believe is accurate output. Now I want to conduct Grid Independent Test in order to verify the result. I prepared seven different meshes to test, number of grid points ranging from 100,000 to 6,400,000 (100000,200000,400000,800000,1600000,3200000 and 6400000). I graphed instantaneous values of output power to compare the result. But what I found is, only three of seven graphs look alike. Other four (two with least number of grid points and two with most number of grid points) graphs look deviated. I have attached some of the graphs below. However, if I look contour of volume fraction of water for all cases, flow looks correct and promising. I it wise to accept the simulation and move forward with these results? |
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git, moment, power, torque, vof |
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