Kinetic Energy
Answers
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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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Altair Employee