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mkress

Kinetic Energy

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Hi guys,

 

i would like to compare the kinetic energy of the fluid of different simulations.

In AcuProbe i have only Surface Outputs, nothing like Fluid Output.

 

Have anyone an idea which settings i need for the kinetic energy of the fluid?

 

 

Regards,

Michael

 

 

 

 

 

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You can get some element set averaged quantities if you use a non-zero value for integrated_output_frequency in the ELEMENT_OUTPUT command for your desired fluid volume.  That will give you turbulent kinetic energy.  How do you wish to define - or what do you mean by - 'kinetic energy'?

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Hi acupro,

thank you for your reply!

I simulate the movements of water in a vessel (multiphase, transient). To reduce the fluid movements inside the vessel, i analyze the shape of tank and improve these.

For these studies I want to use the kinetic energy of the fluid. If the amount less the amount of kinetic energy before, I have lowerd the movements inside.

Besides I want compare the results of the kinetic energy from AcuSolve with another CFD-Software, to check the accuracy and differences. Therefore, I need the kinetic energy in the unit Joule or without the mass in m²/s².

 

I´m still a beginner in AcuSolve, perhaps you could show me a screenshot where I implement the command “integrated_output_frequency”. Where could I find ELEMENT_OUTPUT, in the .inp-File?

 

It is possible to get this information’s also from existing AcuSolve results (.log – File)?

 

Thank you very much in advance for your answer!

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If we assume you have an element set named "flow" - like

 

ELEMENT_SET( "flow" ) {

...

...

}

 

then

ELEMENT_OUTPUT( "sample" ) {
 element_set                     = "flow"
 type                            = all
 integrated_output_frequency     = 5
 integrated_output_time_interval = 0.0
 num_user_output                 = 0
}

will give you integrated information for that element set every five time steps.  One of the integrated quantities will be turbulent-kinetic-energy.  But I'm not sure how one would integrate total kinetic energy.  Does you other solver give the equation used for what is reported as kinetic energy?

 

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You may have to write a user function to be used with the ELEMENT_OUTPUT command - to define the element kinetic energy, then the integrated user function quantity will be accessible in the integrated element output data.

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Thank you very much, it works!

 

I have insert

 

"ELEMENT_OUTPUT( "sample" ) {
element_set                     = "flow"
type                            = all
integrated_output_frequency     = 5
integrated_output_time_interval = 0.0
num_user_output                 = 0
}"

 

into the AcuSolve input-File and i get the mass_ave_kinetic_energy for my tests. Everything perfect!

 

 

Is there a way, where i do not have to rewrite the input-File?

 

 

 

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