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how to model varying gravity in Star CCM+

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Old   November 15, 2009, 11:07
Post modeling of slosh analysis with time varying accel/decell
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joy
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I am trying to model some sloshing analysis in a fuel tank of an marine engine. I want to give accel/decel which is varying with time.
In reference values i was able to give constant accel/decel but not varying. I will be thankful if some one can provide me solution.

Last edited by mohan makana; November 15, 2009 at 11:27. Reason: delete
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Old   November 25, 2009, 02:06
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Two suggestions:

1. very easy method - simply type an equation into the gravity setting for X (ie replace 0 with say sin($Time * 3.2) or whatever.

2. easy method - create a field function called say GravX, and set its value to the required equation -
eg sin($Time * 3.2). Then simply type this field function name into the gravity setting for X (ie replace 0 with $GravX).

Even thought lots of menus dont have a field function dropdown and only constant settings, you can still type in a field function name or equation - very handy and not well documented!

3. harder method - do a java macro and solve via the macro changing the gravity constants every timestep.
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