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How to obtain values of Energy, Continuity and X, Y, Z Momentum in StarCCM+

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Old   April 3, 2018, 12:02
Default How to obtain values of Energy, Continuity and X, Y, Z Momentum in StarCCM+
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Hello everyone,

As the title suggests, I would like to obtain/access the values of Continuity, Energy and all the Momentums within the fluid domain in StarCCM+. Sort of like how you can use a predefined field function of Pressure Coefficient to obtain the values of Cp. Is there any method as to how to obtain such values since I could not find any predefined field function?

Thanks
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Old   April 4, 2018, 08:24
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Sebastian Engel
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Hello,

no, there aren't predefined functions the way you want them, except one, i guess. But they are easy to obtain.

have a look at the Solver settings, such as the Coupled Solver. In its options you'll find one which is called "Temporary Storage Retained". Activate it. Then you'll have access to the Residuals and Gradiants and intermediate quantities.

"Continuity" can be found under Mass Imbalance, while "Energy" is Total Enthalpy substracted by pressure/density (E = H - p/rho). However the Momentum always needs a reference point, right? To get the momentum of a certain surface, you'll find a momentum report. If you are looking for the local body forces you need to do a bit more.
Have a look into the manual and look for equation 150ff for more information.

Best regards,
Sebastian
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Old   April 4, 2018, 11:54
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Quote:
Originally Posted by bluebase View Post
Hello,

no, there aren't predefined functions the way you want them, except one, i guess. But they are easy to obtain.

have a look at the Solver settings, such as the Coupled Solver. In its options you'll find one which is called "Temporary Storage Retained". Activate it. Then you'll have access to the Residuals and Gradiants and intermediate quantities.

"Continuity" can be found under Mass Imbalance, while "Energy" is Total Enthalpy substracted by pressure/density (E = H - p/rho). However the Momentum always needs a reference point, right? To get the momentum of a certain surface, you'll find a momentum report. If you are looking for the local body forces you need to do a bit more.
Have a look into the manual and look for equation 150ff for more information.

Best regards,
Sebastian
Hello Sebastian,

Thank you for your quick response.
I will check out the steps that you outlined and will get back to you if I am still stuck.
Thanks alot!
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Old   May 21, 2018, 17:42
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Quote:
Originally Posted by bluebase View Post
Hello,

no, there aren't predefined functions the way you want them, except one, i guess. But they are easy to obtain.

have a look at the Solver settings, such as the Coupled Solver. In its options you'll find one which is called "Temporary Storage Retained". Activate it. Then you'll have access to the Residuals and Gradiants and intermediate quantities.

"Continuity" can be found under Mass Imbalance, while "Energy" is Total Enthalpy substracted by pressure/density (E = H - p/rho). However the Momentum always needs a reference point, right? To get the momentum of a certain surface, you'll find a momentum report. If you are looking for the local body forces you need to do a bit more.
Have a look into the manual and look for equation 150ff for more information.

Best regards,
Sebastian
Hi there sebastian! I still have a bit of trouble in finding out the x, y and z momentum values. I did not find any eq 150ff (maybe the ff was a typo?). Can you please provide me with some insight on how to derive them?

Thank you
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Old   May 22, 2018, 06:34
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Sebastian Engel
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Hi,

i guess giving only the equation reference wasn't the best idea.

Search for Theory > Numerical Flow Solution > Finite Volume Discretization > Coupled Flow Solver
Then you'll get the underlying equations which you might have to integrate to get momentum on a specific entity.
Best regards,
Sebastian
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Old   May 22, 2018, 23:35
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Quote:
Originally Posted by bluebase View Post
Hi,

i guess giving only the equation reference wasn't the best idea.

Search for Theory > Numerical Flow Solution > Finite Volume Discretization > Coupled Flow Solver
Then you'll get the underlying equations which you might have to integrate to get momentum on a specific entity.
Best regards,
Sebastian
I'll check it out. Thank u
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