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mohamadalimirzaei1994 February 1, 2017 09:15
no slip wall condition
 
I want to numerically simulate drilling mud(a power law fluid) flowing inside a well.
for each node, I have 3 equations (continuity,z-comp motion, r-comp motion) which mean I also need 3 equations on boundaries.
on wall boundary condition I know vr and vz must be set to zero but I do not know what is 3rd equation on the wall.
can anybody help me?
best regards

FMDenaro February 1, 2017 10:40
Quote:
Originally Posted by mohamadalimirzaei1994 (Post 635471)
I want to numerically simulate drilling mud(a power law fluid) flowing inside a well.
for each node, I have 3 equations (continuity,z-comp motion, r-comp motion) which mean I also need 3 equations on boundaries.
on wall boundary condition I know vr and vz must be set to zero but I do not know what is 3rd equation on the wall.
can anybody help me?
best regards

the mass flux has zero normal component on a not-permeable wall, otherwise a permeable wall requires to know an additional condition on the flux

mohamadalimirzaei1994 February 1, 2017 11:01
i set this condition(vr=0) and vz=0
I'm looking for 3rd condition on the wall

FMDenaro February 1, 2017 11:01
Quote:
Originally Posted by mohamadalimirzaei1994 (Post 635488)
i set this condition(vr=0) and vz=0
I'm looking for 3rd condition on the wall

I do not understand, you need to prescribe the BC for each one of the 3 equations ....


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