# boundary condition problem - NEED HELP

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 August 6, 2007, 04:09 boundary condition problem - NEED HELP #1 rave Guest   Posts: n/a friends, I have a fuselage at the centre of a cubical box. I have created the volume mesh in the box for the flow around the fuselage. I want to assign the fuselage surface as a no-slip wall boundary condition, but i m not able to select the cell-set for this. the problem is tht, the fuselage is a closed body and thr r 3 EXTRUSION layers around it. i want to select the inner surface cell set for the wall boundary region. I tried to do it by keeping the clipped hidden view, but tht way not all the surface cells got selected. after this individually selecting the remaining cells is a TASK. if sm1 can tell me any other way for defining the boundary region, I shall be thankful to him.

 August 6, 2007, 06:24 Re: boundary condition problem - NEED HELP #2 Klaas Klever Guest   Posts: n/a Put shells on your model surface (live surf). Select the shells of the part you are interested in and a) assigne your BCs (if you are using V3.26) b) select the volume cells that have faces on your shell set and then assign the BCs (if you are using V4). you will have to do that in at least two steps. do a bmerge afterwards to eliminate double BCs. If you use the mesher in Star-CCM you can define those boundaries more easily.

 August 7, 2007, 02:19 Re: boundary condition problem - NEED HELP #3 rave Guest   Posts: n/a thnk fr the help. I'll try tht. but I also started doing it in another way. I cut the geometry and then attach it to a symmetry plane. in this way the fuselage inner surface wil be visible, so it can be easily selected.