|October 28, 2009, 11:40||
Surface Pressure Osciallation
Join Date: Sep 2009
Posts: 12Rep Power: 7
I am simulating flow around a wind turbine blade section. The Reynolds number is quite high (3e6) and as such i am using a turbulent model. I am none too familiar with turbulence theories but have been using the k-omega with a turbulent kinetic energy calculated via k=(3/2)(Ti*U)^2 and specific dissipation from k/w<=Re .
I am searching for a steady state solution to compare with some experimental results. The simulation runs and converges fine and lift data is roughly 5% low compared to the experimental data. Where i'm having issues is on the surface pressure distributions. I'm getting some checker boarding on the top leading edge of the airfoil and i can't figure out why. Below is an element plot of the pressure contour and i have circle the checker boarding.
Here is a picture of my grid. I built the grid in such a way that for the first 1% of chord away from the airfoil i used a structured grid and then progressed to an unstructured grid. Also a closeup of the mesh near the airfoil. I am using a Y+ of about 14 here. I have tried from 20 down to 4 with the same oscillating surface pressure results.
Here is a plot of the surface pressure compared to the experimental data i have. You can see the squigles at the top leading edge of the airfoil.
Anyone have any ideas on how to get rid of these. I have read about the Rhie and Chow technique of discretization and i and assume fluent can use this. I must be using the wrong solver or have a parameter set wrong. Also this is an incompressible simulation.
|Thread||Thread Starter||Forum||Replies||Last Post|
|Calculation of the Governing Equations||Mihail||CFX||7||September 7, 2014 06:27|
|"Pressure Inlet" Boundary Setup||Wijaya||FLUENT||13||April 11, 2013 08:50|
|Pressure enigma.||Sara||Main CFD Forum||22||July 30, 2009 04:46|
|How to get the pressure force on a surface?||Jimmy||CD-adapco||5||January 25, 2008 06:54|
|Hydrostatic pressure in 2-phase flow modeling (CFX4.2)||HB &DS||CFX||0||January 9, 2000 14:19|