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#1 |
New Member
Pedro Dieguez
Join Date: Mar 2020
Posts: 4
Rep Power: 6 ![]() |
ANSYS-CFX Free suface model.
The simulation es very simple: Box with water and air; no movement. CFX-Pre: Homogeneous model, free surface model standard, isothermal, laminar, fluid bouyancy model: density difference, surface tension mode: none, interface transfer: free surface. Initial conditions are: zero velocity, volume fraction of water and air and pressure. Steady state. InitialZ (height of water): 0 [m] initial water volume fraction: if((z<InitialZ), 1, 0) initial air volume fraction: 1 - OceanoVFAgua initial pressure: if((z<InitialZ), ((997 [kg m^-3] - 1.185 [kg m^-3])*g*(InitialZ-z)), 0 [Pa]) After run, the results are: hidrostatic pressure OK low or very velocities (1e-3 m/s), but they must be zero and Normalised Imbalance Summary | +--------------------------------------------------------------------+ | Equation | Maximum Flow | Imbalance (%) | +--------------------------------------------------------------------+ | U-Mom-Bulk | 1.2143E+06 | 0.0000 | | V-Mom-Bulk | 1.2143E+06 | 0.0000 | | W-Mom-Bulk | 1.2143E+06 | -0.0005 | | P-Vol | 2.9663E-04 | -100.0000 | +----------------------+-----------------------+---------------------+ | Mass-Water | 1.6829E-15 | -100.0000 | +----------------------+-----------------------+---------------------+ Does anyone know if this is correct? Why these imbalances? Thanks in advance. Best regards. |
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#2 |
Senior Member
Gert-Jan
Join Date: Oct 2012
Location: Europe
Posts: 1,885
Rep Power: 27 ![]() |
Mass imbalance is based on amount of inflow. If there is no inflow, then there is no reference and mass imbalance is 100% in your case.
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#3 |
New Member
Pedro Dieguez
Join Date: Mar 2020
Posts: 4
Rep Power: 6 ![]() |
Thank you very much for your help, Gert-Jan.
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Tags |
cfx-pre, free suface, p-vol imbalance |
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