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Total mass of the mixture in a closed domain is changing with time. |
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April 21, 2022, 00:59 |
Total mass of the mixture in a closed domain is changing with time.
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ABHINAV SINGH
Join Date: Sep 2021
Posts: 4
Rep Power: 4 |
I am working with 2-D transient simulation with compressible flow, gravity assisted.
I am using VOF- multiphase model and evaporation condensation model as the phase change model, with saturation temperature as a function of saturation pressure. liquid is primary phase and Vapor is secondary phase. liquid properties - piece-wise polynomial function of temperature vapor density - Ideal gas vapor viscosity and thermal conductivity - piece-wise poly function of temperature. Operating pressure - 0, gauge pressure - 76043 Pa Operating density - 0 kg/m3 Initial temp - 75K CONVERGANCE criteria - (continuity - 1e-05), (velocity - 1e-04) and (energy - 1e-06) SOLUTION METHODS Pressure-velocity coupling - PISO Gradient - Least squares cell based Pressure - Body force weighted Density - second order upwind Momentum - Quick Volume fraction - geo-reconstruct Energy - first order upwind All the URFs are default. why is total mass changing with time and also the continuity residual falls in the range of 1e-01 to 1e+02? |
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