Constant Speed Submarine 3D Dynamic Mesh - Fluent

cmunikat · February 25, 2022, 14:59

Hello,
* Lets say that I am trying to simulate a simplified submarine, 3D.
* It travels at constant speed.
* The submarine movement is controlled by UDF, no explicit propulsion is simulated.
*ERROR MESSATE: NEGATIVE CELL VOLUME DETECTED
* I COULD PROPERLY SIMULATE THIS ON FLUENT 2D, BUT TRIED EVERYTHING AND ALWAYS FAILS ON 3D SIMULATION.
* I tried using smaller time step, layering, smoothing and remeshing combinations. Always the problem above.

* COULD YOU PLEASE SUGGEST HOW TO SET UP THIS MODEL?

THANKS

destroy · March 5, 2022, 18:24

Is this a rigid body?
If so, maybe try the overset mesh, instead of dynamic mesh, which is very error-prone.

February 25, 2022, 14:59	Constant Speed Submarine 3D Dynamic Mesh - Fluent	#1
cmunikat New Member cmunikat Join Date: Feb 2022 Posts: 1 Rep Power: 0	Hello, * Lets say that I am trying to simulate a simplified submarine, 3D. * It travels at constant speed. * The submarine movement is controlled by UDF, no explicit propulsion is simulated. ERROR MESSATE: NEGATIVE CELL VOLUME DETECTED I COULD PROPERLY SIMULATE THIS ON FLUENT 2D, BUT TRIED EVERYTHING AND ALWAYS FAILS ON 3D SIMULATION. * I tried using smaller time step, layering, smoothing and remeshing combinations. Always the problem above. * COULD YOU PLEASE SUGGEST HOW TO SET UP THIS MODEL? THANKS

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March 5, 2022, 18:24		#2
destroy Member Marcin Join Date: Jun 2016 Posts: 98 Rep Power: 10	Is this a rigid body? If so, maybe try the overset mesh, instead of dynamic mesh, which is very error-prone.