# Grid generation and Compressible Euler equations

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 September 3, 2008, 16:28 Grid generation and Compressible Euler equations #1 oe Guest   Posts: n/a When generating grids for a supersonic jet impingement flow, and solving the compressible Eulers equations should y+ value be considered, in placing the first grid point from the wall. Thanks a lot

 September 4, 2008, 02:57 Re: Grid generation and Compressible Euler equatio #2 Charles Guest   Posts: n/a y+ is a dimensionless boundary layer characteristic. If you have a boundary layer with Euler equations you have a problem.

 September 7, 2008, 03:48 Re: Grid generation and Compressible Euler equatio #3 shuo Guest   Posts: n/a Hi oe, I am also working on supersonic impinging jets for my PhD. Should get in touch. Shuo

 September 8, 2008, 11:51 Re: Grid generation and Compressible Euler equatio #4 oe Guest   Posts: n/a Hi Charles, Thanks for the reply Charles and Shuo. I am interested in studying the unsteady pressure signature on the plate. And my understanding is that a stagnation region is created where the jet impinges on the plate (this is where y+ value would be important). Beyond this region the flow again continues to be sonic/supersonic. Obviously all this depending on the distance of the plate the from the jet exit and the pressure ratio. Since the interest is in unsteady pressure signature how important is the y+ in grid generation? Or can I ask what should be the criteria for grid generation when solving compressible Euler equations? Shuo what aspect of supersonic impinging jet are you looking at? it would be good to interact. Thanks again.

 September 8, 2008, 14:41 Re: Grid generation and Compressible Euler equatio #5 Ahmed Guest   Posts: n/a (this is where y+ value would be important) How would you calculate that y+ in a Zero kinematic viscocity fluid? you are solving Euler's equations, right Am I missing something here Is it the same Euler's equations I studied more than twenty years ago or what?

 September 8, 2008, 15:28 Re: Grid generation and Compressible Euler equatio #6 oe Guest   Posts: n/a Yes I am solving for Compressible Euler's equations. You are right about the zero kinematic viscosity. My question is where should the first grid point be placed (distance from the wall). Is there any criteria for that? Thanks

 September 8, 2008, 21:02 Re: Grid generation and Compressible Euler equatio #7 Shuo Guest   Posts: n/a Hi oe SInce your solving Euler equations, there shouldn't be a boundary layer/wall jet along the plate. My email address is Shuo.Li@eng.monash.edu.au if you want to discuss it more. Shuo

 September 8, 2008, 21:28 Re: Grid generation and Compressible Euler equatio #8 Ahmed Guest   Posts: n/a I am not aware of such rule, and would appreciate if you find something to the respect that you put it to my attention. You have to look for error estimation and reduce the size of your mesh accordingly, Good luck in your research.

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