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Simulate a oil jet impinge a rotating shaft.

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Old   March 12, 2023, 05:12
Smile Simulate a oil jet impinge a rotating shaft.
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i want to simulate a oil jet impinge a rotating shaft using fluent, and i want to see some droplet that is made by jet impinge, i have done it with fluent and openfoam, but i can't simulate what i hope to see. I need some help from you!
You can see my result in the picture, i don't know where is the dropjet.
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Old   March 12, 2023, 06:13
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Is this RANS simulation? If yes, you will never see droplets.
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Old   March 12, 2023, 10:01
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Originally Posted by LoGaL View Post
Is this RANS simulation? If yes, you will never see droplets.
yes, i using k-epsilon model to simulate, and that is my parameter. I am comfusing and i really want to know why i can't get the situation i want.
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Old   March 12, 2023, 10:24
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With a steady RANS you will never see droplets. You need to do Large Eddy Simulations (unsteady). However, why do you need to see droplets?
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Old   March 12, 2023, 10:48
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With a steady RANS you will never see droplets. You need to do Large Eddy Simulations (unsteady). However, why do you need to see droplets?
Oh, i will try your suggestions. that is a work from my supervisor. My target is to calculate how much water go across the obstacle. I have done my experiment and i hope to get the similar result by calculation. but the calculation is wrong, so i think that it is because i am not simulating the water droplets, or ignoring the dynamic process which water impinge rotating shaft.
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Old   March 12, 2023, 11:01
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Ok as I suspected, you think you need to see droplets. In reality they of course are there, however, to calculate how much water goes through the obstacle, you probably do not need to see droplets. Nor I would suggest you to do Large Eddy Simulation

Stick to RANS, and make sure you are doing it correctly (ie. Converged simulation, mesh independent, test different turbulence models, play with the VOF settings)
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Old   March 12, 2023, 11:11
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Thank you very much, your advice is very important for me.
Maybe i shoud change my turbulence model first.
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jet breakup, two-phase flow

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