# Boundary conditions on a C mesh

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 November 5, 2012, 05:43 Boundary conditions on a C mesh #1 Member   Simone Join Date: Sep 2012 Posts: 95 Rep Power: 6 Good morning to everyone, I have a simple question.. I'm simulating a flow over an airfoil with a "C mesh", and I was thinking about this: in such a mesh i believe that the "inlet" is made up of the C itself plus the top and the bottom, while the outlet is only the remaining patch on the right. But now I'm in doubts if I'm doing the right things.. Can anyone help me? Thanks Simone

 November 5, 2012, 07:04 #2 Senior Member   Join Date: Aug 2010 Location: Groningen, The Netherlands Posts: 216 Rep Power: 11 Dear Simone, the answer to your question depends on whether you have an inclined flow or a flow parallel to the skeleton line for the inclined flow: you define the C and the lower straight wall as an inlet and the straight back and upper wall as outlet (if the flow comes from the lower right corner, is the flow coming from above the upper and lower straight wall definitions are inverted) for a flow parallel to the skeleton line: you define the C as inlet the upper and lower wall as wall with a no slip condition however take care that the distance wall-profile is big enough to avoid blockage and finally the straight back wall as outlet regards Colin

 November 5, 2012, 07:12 #3 Member   Simone Join Date: Sep 2012 Posts: 95 Rep Power: 6 Well, my flow is entering the domain from the "C" which is on the left, with the inclined airfoil..so I have to change my boundary conditions because they were wrong! It has sense that the flow enter "from the C" right? I don't have to split it right? Thanks Colin

 November 5, 2012, 07:34 #4 Senior Member   Join Date: Aug 2010 Location: Groningen, The Netherlands Posts: 216 Rep Power: 11 As you mentioned the second description matches to your case, thats right. I have to note that I was assuming that the flow is coming from the right side with the C part on the right side as well, (sry I used shipbuilding standards on my foils so everything is little bit different). so you have to turn around everything I said. regards Colin

 November 5, 2012, 07:38 #5 Member   Simone Join Date: Sep 2012 Posts: 95 Rep Power: 6 Ok so..with my "C" on the left, inclined flow, and flow entering from the left I define the "C" and the lower part as inlet right, while the top and the vertical patch on the right form the outlet?

 November 6, 2012, 06:40 #6 Senior Member   Join Date: Aug 2010 Location: Groningen, The Netherlands Posts: 216 Rep Power: 11 yes that sounds good

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