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August 1, 2003, 18:29 |
time step size
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#1 |
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Hi guys, who can tell me why time-step-size setting changes the mass-flowrate result so much? I am doing a 2D two-phase(oil-gas) UNSTEADY flow model simulation which employed VOF. Because the final flow rate cann't match the experiment data very well, I set different conditions and whatever to try to solve out. Usually I set time-step-size as 1, when I set 0.5, the mass flow rate at outlet doubled, moreover when I set o.1, the result is double of the 0.5 one. I guarantee other settings are absoutly the same.My model's mass flow rate is 1e-6~2e-6kg/s usually, quite slow. It shouldn't happen from the tutorial statement. I am so appreciated for any answer.
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