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November 2, 2015, 08:31 |
IDEAL GAS: not fulfilled even though set up?
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#1 |
New Member
Gergö Schmidt
Join Date: Oct 2015
Posts: 5
Rep Power: 10 |
Hi everybody!
My aim is to simulate pressure equalization in inviscid air (density: ideal gas; Cp = 1004.9 J*K^-1*kg^-1; M = 28.966 g*mol^-1). Therefor I patch 2 different regions with 2 different initial pressures. I have obtained converging results only with a density-based solver and I had chosen an explicit transient formulation with CFL=0.75 for starting. My continuity, velocity and energy residuals are nicely declining during calculation, BUT when I calculate my ideal gas resiudal with Absolute Pressure-R/28.966[g mol^-1]*Total Temperature*Density I obtain residuals up to 30% of the local absolute pressure. This is a problem, because I'd like to comprare the results with ideal analytic solutions. My questions are therefore: 1) Is my way of calculating the ideal gas residual (see expression above) correct? 2) If 1) is yes, what can I do to get results which are more consistent with the ideal gas law? Thank you and kind regards! Gergö |
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Tags |
explicit dynamics, ideal gas, pressure equalization, residuals |
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