buoyantPressure
Hi everyone
please please someone clearfy this boundary condition: "buoyantPressure" every where i read or ask, just hear something like this: .the buoyantPressure boundary condition is applied to the pressure field, which calculates the normal gradient from the local density gradient. please someone describe this BC with math and physics. what will exactly happen when we set buoyantPressure at boundary???:confused: thanks all 
no one can explain something about this BC? every thing that you know!!!!:(

Greetings Antonio and welcome to the forum!
I don't know the specific mathematical equations, but according to the source code: https://github.com/OpenFOAM/OpenFOAM...uoyantPressure Quote:
As for buoyancy equations, did you try Wikipedia? http://en.wikipedia.org/wiki/Buoyancy ;) If you compare the source code with those equations, I think you might understand things a bit more ;) Best regards, Bruno 
Hi Bruno
Thanks for your comment. i tried source codes before, but if i knew the codes, why i asked my friends to help!!!!!!!!!!!!!!!. ;);) i think i know enough about buoyancy but OpenFoam, BC and codes are something else! i think it's cant help: " If the variable name is "pd" assume it is p  rho*g.h and set the gradient appropriately. Otherwise assume the variable is the static pressure. by the way thank you for your attention. is there any idea Regards 
Hi Antonio,
Unfortunately, time is very limited for everyone these days. And I'm not familiar with this boundary condition, so I provided you with the reference details, so that you could use them as a starting point to investigate it further. From what I can briefly understand, this boundary condition takes into account the density of the fluid and balances the pressure with "rho*g*h", by affecting the pressure gradient directly. The code is also taking into account the vectorial values between the patch the BC is on and gravity's vector. If you still have questions on this, please indicate what are the specific details that you are having trouble understanding. Best regards, Bruno 
Hi Bruno
special thanks to your reply, unfortunately i couldn't acces this site for twoo weeks. for first: "this boundary condition takes into account the density of the fluid and balances the pressure with "rho*g*h", by affecting the pressure gradient directly.." im sorry really i cant understand: how it balance pressure with rho*g*h ? 
hi Antonio,
you can find all the information about buoyant pressure here: http://foam.sourceforge.net/docs/cpp...0.html#details 
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