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Old   July 22, 2012, 01:47
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Amin
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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?

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Old   July 26, 2012, 16:52
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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.

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Old   July 28, 2012, 15:51
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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.
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Old   July 28, 2012, 18:07
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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).

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Old   July 29, 2012, 13:41
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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 ????
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Old   July 30, 2012, 14:54
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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.

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Old   August 1, 2012, 06:15
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yes Santiago. of course i do that.
thank you
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