# RIPPLE's free surface boundary condition

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 February 6, 2011, 04:26 RIPPLE's free surface boundary condition #1 New Member   Cheng Zhang Join Date: Oct 2009 Posts: 11 Rep Power: 8 In SOLA-VOF's code,the pressure in surface cell is interpolated by neighbouring fluid cell with a variable 'PETA'. In RIPPLE, a improved method 'CSF' replaces the free surface pressure condition, and i cannot find 'PETA' again. My question is:does RIPPLE still use interpolation to obtain pressure in surface cells? if not, how can i get it? Thanks.

 February 7, 2011, 16:13 boundary condition #2 New Member   Veskov Eugene Join Date: Feb 2011 Posts: 8 Rep Power: 7 See http://math.rug.nl/~veldman/publications DeJong-afstudeerferslag.pdf and other articles and dissertation. if you have RIPPLE source code please send it to me. My e-mail: vs198080@mail.ru. I am try understand pressure boundary condition. I have SOLA-VOF, VOF-2D, VOF -3D source code.

 February 8, 2011, 08:28 #3 New Member   Cheng Zhang Join Date: Oct 2009 Posts: 11 Rep Power: 8 Hi ves Thank you for your reply. but i have no RIPPLE's code either, and your adress is invalid. Along

 February 9, 2011, 14:11 #4 New Member   Veskov Eugene Join Date: Feb 2011 Posts: 8 Rep Power: 7 http://www.math.rug.nl/~veldman/publications.html This link is work. This page have links for aricles and PhD, see Gerris PhD , Kleffsman PhD, and DeJong article. It is explained pressure Poisson boundary condition for projection method solving Navier-Stokes equation (this metod used in RIPPLE). RIPPLE User Manual have not information about pressure boundary condition, but in above works used coefficient peta same as SOLA-VOF. By means of this coefficient PETA coefficients of the Poisson equation are calculated. I developed the software based on above works, SOLA-VOF, Veldman sample program (not free surface), but pressure calculation wrong. Why? I do not know. Veldman page consist samle and lecture.

 February 10, 2011, 00:35 #5 New Member   Cheng Zhang Join Date: Oct 2009 Posts: 11 Rep Power: 8 Ves Thank you for your help. This is my first time contact with Veldman sample program, what's the problom with your pressure calculation? can you tell me the detail? Along

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