Grid Refinement Study - How many cells necessary for accurate results?

ejvikings · January 21, 2012, 16:28

Hey, I'm modeling the burning of leaves and need help determining the number of grids necessary for accurate results. In my model, I have assumed axisymmetric conditions along the x-axis so that the leaf appears to be solid circle. The burner is on the left, and I have udf's to model emissivity of the leaf as it burns.

About the grid. I've constructed the grid in gambit. For the leaf, there's 5 grid cells for thickness of the leaf and 77 grids across the surface to make 385 cells in the leaf interior. The surrounding gas phase is 1574 grid cells. Also, the time step I've used in fluent is .05s.

Any input or suggestions on how accurate this model is would be great.

Picture of grid in link below

http://imageshack.us/photo/my-images...doneleaf1.png/

shk12345 · January 22, 2012, 01:33

your mesh is too course
make it fine and then try

January 21, 2012, 16:28	Grid Refinement Study - How many cells necessary for accurate results?	#1
ejvikings New Member Edward Overy Jr. Join Date: Jan 2012 Posts: 5 Rep Power: 14	Hey, I'm modeling the burning of leaves and need help determining the number of grids necessary for accurate results. In my model, I have assumed axisymmetric conditions along the x-axis so that the leaf appears to be solid circle. The burner is on the left, and I have udf's to model emissivity of the leaf as it burns. About the grid. I've constructed the grid in gambit. For the leaf, there's 5 grid cells for thickness of the leaf and 77 grids across the surface to make 385 cells in the leaf interior. The surrounding gas phase is 1574 grid cells. Also, the time step I've used in fluent is .05s. Any input or suggestions on how accurate this model is would be great. Picture of grid in link below http://imageshack.us/photo/my-images...doneleaf1.png/

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January 22, 2012, 01:33		#2
shk12345 Senior Member shoeb khan Join Date: Nov 2011 Posts: 179 Rep Power: 15	your mesh is too course make it fine and then try