# interfoam bc

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 July 22, 2012, 01:47 interfoam bc #1 Member   Amin Join Date: Mar 2012 Posts: 60 Rep Power: 5 Hi Foamers i have problems with pressure boundary condition in interfoam yet. (openfoam 1.6) 1. what is P in interfoam? static or total or gage pressure? 2. what's the buoyantpressure condition? 3. does interfoam solve equations completely dimensionless? Regards

 July 26, 2012, 16:52 #2 Senior Member     Santiago Marquez Damian Join Date: Aug 2009 Location: Santa Fe, Santa Fe, Argentina Posts: 420 Rep Power: 15 Hi Amin, 1. In 1.6 is static pressure. 2. Is a condition intended for walls where no pressure is known, the pressure gradient is set to the value of rho*g & wall_normal 3. No, the full dimensional equations are solved. Regards. __________________ Santiago MÁRQUEZ DAMIÁN, Ph.D. Post-doctoral Fellow Research Center for Computational Mechanics (CIMEC) - CONICET/FICH-UNL T.E.: 54-342-4511594 Ext. 1005 Güemes 3450 - (3000) Santa Fe Santa Fe - Argentina http://www.cimec.org.ar

 July 28, 2012, 15:51 #3 Member   Amin Join Date: Mar 2012 Posts: 60 Rep Power: 5 Hi Santiago Thanks for your reply. "" 3. No, the full dimensional equations are solved. "" you mean that we have to use exact properties for fluid and use meter in our simulation.

 July 28, 2012, 18:07 #4 Senior Member     Santiago Marquez Damian Join Date: Aug 2009 Location: Santa Fe, Santa Fe, Argentina Posts: 420 Rep Power: 15 Hi, it means that the Eqns. are written the same you find in a book doing the mass and momentum balances without obtaining the dimensionless version. So that the velocities are in m/sec, pressure in Pa and viscosity in Pa sec (dynamic viscosity). Regards. __________________ Santiago MÁRQUEZ DAMIÁN, Ph.D. Post-doctoral Fellow Research Center for Computational Mechanics (CIMEC) - CONICET/FICH-UNL T.E.: 54-342-4511594 Ext. 1005 Güemes 3450 - (3000) Santa Fe Santa Fe - Argentina http://www.cimec.org.ar

 July 29, 2012, 13:41 #5 Member   Amin Join Date: Mar 2012 Posts: 60 Rep Power: 5 Thanks for your attention my means was that if in simulation we want the Re=(u*d)/nu=180 , Can we set velocity(u), diameter(d) or nu in arbitary values to obtain Re=180 ? means: is simulation with u=180 m/s , d=1 m , nu=1 same with simulation with u=180*10^-6 , d=1 , nu=10^-6 ????

 July 30, 2012, 14:54 #6 Senior Member     Santiago Marquez Damian Join Date: Aug 2009 Location: Santa Fe, Santa Fe, Argentina Posts: 420 Rep Power: 15 Amin, take into account that in multiphase flow you have other non-dimensional numbers, like Froude, Eotvos, Weber, etc. so that, in order to have similarity you have to check all the non-dimensional relevant numbers of you problem. Regards. __________________ Santiago MÁRQUEZ DAMIÁN, Ph.D. Post-doctoral Fellow Research Center for Computational Mechanics (CIMEC) - CONICET/FICH-UNL T.E.: 54-342-4511594 Ext. 1005 Güemes 3450 - (3000) Santa Fe Santa Fe - Argentina http://www.cimec.org.ar

 August 1, 2012, 06:15 #7 Member   Amin Join Date: Mar 2012 Posts: 60 Rep Power: 5 yes Santiago. of course i do that. thank you

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