# Grid Independent Study for a car

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 January 26, 2011, 15:31 Grid Independent Study for a car #1 Member   John Join Date: Jan 2011 Posts: 64 Rep Power: 7 HI, I have a car and I need to perform grid independent study on the car, I have made the default mesh and it was OK however I need the grid independent study for better meshing. Does anyone have a good website I can learn how to create grid independent study? Thanks a lot, J

 January 26, 2011, 20:05 #2 Senior Member   Julien de Charentenay Join Date: Jun 2009 Location: Australia Posts: 230 Rep Power: 10 Hi J, A grid independent study (which should be called grid dependence study) looks at how the solution evolves with the grid resolution. Here is how you can undertake such study: 1) Build a reference grid G; 2) Run the simulation on the reference grid (to a defined convergence level); 3) Extract relevant information (drag?); 4) Build a refined grid G-R1 (if you do it by the book it is refined by 2 in all directions); 5) Run simulation 6) Extract relevant information; 7) Build a refined grid G-R2 (refined compared to G-R1) and redo 5 and 6 on R2 8) Plot the relevant information as a function of G, G-R1 and G-R2. The solution is grid independent if the information does not change with G, G-R1 and G-R2 (meaning that your grid R is "fine enough" to capture the physics/numerics/etc). Hope this help. Julien __________________ --- Julien de Charentenay

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