# [ICEM] Edge Parameters Question

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 August 14, 2013, 04:34 Edge Parameters Question #1 Senior Member     Philipp Join Date: Jun 2011 Location: Germany Posts: 1,297 Rep Power: 19 Hi, I use ICEM 14.5 Hexa to mesh some geometry. Now, one of the edges doesn't behave as I expect: I use "Exponential2" mesh law, what I want is Spacing 1 = 0.4 Spacing 2 = 0.005 What I get is: Spacing 1 = 0.63 Spacing 2 = 0.005 I found out, that I need to increase the number of nodes to get what I want. The question is: How can I let ICEM choose the ratios so I get the two mesh spacings? __________________ The skeleton ran out of shampoo in the shower.

 August 14, 2013, 09:33 #2 Senior Member   Join Date: Mar 2011 Location: Germany Posts: 422 Rep Power: 12 I guess it also depends upon the initial size. Try playing with that.

 August 14, 2013, 10:09 #3 Super Moderator     Ghazlani M. Ali Join Date: May 2011 Location: Tokyo, Japan Posts: 1,366 Blog Entries: 23 Rep Power: 21 if you have one edge of 1 mm, and decided to add two nodes in the middle with a uniform spacing of 0.1. you can't, it is impossible. you need to add more node, ie 10 nodes in total. you figured it out by yourself. __________________ Regards, New to ICEM CFD, try this document --> https://goo.gl/NEbygB Ali

 August 14, 2013, 10:12 #4 Senior Member     Philipp Join Date: Jun 2011 Location: Germany Posts: 1,297 Rep Power: 19 What I was wondering about: When I start with 0.005 spacing, why can ICEM end with a certain value on the other side, but not with a smaller value? Should be pretty simple, when the initial growth rate is reduced... Edit: If I understand the ICEM help correctly, using "Exponential" I can only choose the first cell height and the number of nodes, everything else is calculated. Can anyone confirm that? __________________ The skeleton ran out of shampoo in the shower.

 August 15, 2013, 10:11 #5 Retired from CFD Online     Simon Pereira Join Date: Mar 2009 Location: Ann Arbor, MI Posts: 2,660 Blog Entries: 1 Rep Power: 38 You could interactively and iteratively adjust your ratio 2 (with your number of nodes fixed) and see if it gives you the size you are looking for... If you have enough nodes, it may work out. At the moment, the ratio is growing too fast so Spacing 1 is getting too large. Reduce Ratio 2 and see what happens. __________________ ----------------------------------------- Please help guide development at ANSYS by filling in these surveys Public ANSYS ICEM CFD Users Survey This second one is more general (Gambit, TGrid and ANSYS Meshing users welcome)... CFD Online Users Survey

 August 15, 2013, 10:13 #6 Retired from CFD Online     Simon Pereira Join Date: Mar 2009 Location: Ann Arbor, MI Posts: 2,660 Blog Entries: 1 Rep Power: 38 I should point out (in case it isn't obvious), that Exponential 2 does not take your spacing 1 setting into account. If you want it to, you can use one of the other options (such as bi exponential). You could also choose the option "From Graphs" and switch the Graph function to "exponential" and control it that way. Best regards, Simo __________________ ----------------------------------------- Please help guide development at ANSYS by filling in these surveys Public ANSYS ICEM CFD Users Survey This second one is more general (Gambit, TGrid and ANSYS Meshing users welcome)... CFD Online Users Survey

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