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April 13, 2015, 09:43 |
Condensation & EulerianFoam
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#1 |
Member
Akr
Join Date: Apr 2015
Location: India
Posts: 53
Rep Power: 10 |
Hello Dear Foamers,
My work is based on Condensation due to Constant wall temperature over a vertical geometry. For the simplicity i have used Steam as the fluid at inlet at 373K, and the left and right wall temperature are fixed to a temperature below Tsat. I have set the Pressure in the internal field of domain to be at atmospheric and so do the pressure outlet. The initial conditions for my test case is provided as below: 0/U1 internalField uniform (0 1 0) inlet - fixedValue (0 1 0); outlet-zeroGradient; walls-fixedValue(0 0 0); (no slip) 0/p internalField uniform 0 inlet - zeroGradient; outlet-fixedValue; uniform 0; walls- zeroGradient; 0/alpha1 internalField uniform 1 (as inlet i have steam which i assume to be 1) inlet - fixedValue, uniform 1; outlet-zeroGradient; walls- zeroGradient; The problem i face is, there is a REVERSE FLOW within the domain, with these boundary conditions i get a reverse flow inside the domain (at the inlet as well as at the outlet) If i ignore gravity (9.81 m/s2) then i get the test case to run (widout reverse flow) bt it doesnt show up any alpha change. with g value set as -9.81m/s2 the reverse flow happens and the iterations immediately shows sigFpe errors. I would be extremely thankful if some one suggest me a solution |
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September 21, 2015, 01:47 |
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#2 |
Member
Akr
Join Date: Apr 2015
Location: India
Posts: 53
Rep Power: 10 |
The problem was solved. It was due to my pressure boundary condition which i stated wrongly according to my context and the sign of my gravitational acceleration term was wrongly inputed
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