errors from meshing

thecfduser · November 11, 2009, 07:47

Hello everybody,
i am a user of Fluent and Gambit.
I would like to know what types of errors are due to the meshing

1-why is it always advised to keep the size ratio of 2 consecutive cells around 1.2 ???
2- why a highly skewed cell will affect the simulation???

I dont understand those 2 points, since as the finite volume method is conservative, i dont see how the grid quality would affect results (a coarser grid will induce a higher truncation error, but why about cells shape?)

Thanks

bob12 · November 12, 2009, 15:07

hello
I hope to clarify the second point: the importance of the shape of the mesh quality is that trasmit an information through it.
for example if the face of a cube transmit this information to another one is perfect, but if it sends it to a curve then it creates a spazial dispersion of information.

November 11, 2009, 07:47	errors from meshing	#1
thecfduser Senior Member karine Join Date: Nov 2009 Posts: 158 Rep Power: 16	Hello everybody, i am a user of Fluent and Gambit. I would like to know what types of errors are due to the meshing 1-why is it always advised to keep the size ratio of 2 consecutive cells around 1.2 ??? 2- why a highly skewed cell will affect the simulation??? I dont understand those 2 points, since as the finite volume method is conservative, i dont see how the grid quality would affect results (a coarser grid will induce a higher truncation error, but why about cells shape?) Thanks

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November 12, 2009, 15:07		#2
bob12 Member Join Date: Oct 2009 Location: Italy Posts: 88 Rep Power: 16	hello I hope to clarify the second point: the importance of the shape of the mesh quality is that trasmit an information through it. for example if the face of a cube transmit this information to another one is perfect, but if it sends it to a curve then it creates a spazial dispersion of information.