thermo->correct

Peter_600 · March 2, 2011, 14:38

Hi at all

What do those functions do?

thermo->correct();

rho = thermo->rho();

Thanks
Peter

mturcios777 · March 2, 2011, 18:16

Thermo->correct updates thermodynamic properties, thermo->rho calculates density based on the thermodynamic model.

Peter_600 · March 3, 2011, 07:07

Thank you very much!

When is it actually necessary to update thermodynamic properties? After mesh motion ? Topological changes?

Does the thermo-> rho step replace my rhoeqn.H file?

Thanks in advance
Peter

mturcios777 · March 4, 2011, 13:46

I guess it depends on what type of model you are running, but if you are solving energy/enthalpy/etc transport equations, then you need to update to thermodynamic properties. Temperature, density and transport properties (like alpha an mu) come from the thermodynamics. I looked at the definition of the correct() member function for hPsiThermo, and all it does is call calculate() which is defined in the following file:

http://foam.sourceforge.net/doc/Doxy...8C_source.html
(for OF 1.6)

thermo.rho() returns the density based on pressure. As such it appears to overwrite the values of the field, but we still needed to solve a transport equation for rho, since most of the equations are coupled through rho.

manafaero · April 1, 2019, 07:58

Dear sir

Could youplease tell me where can i find the definition of correct and update in openfoam. I am using Smagorinsky mode in incompressible LES . For eg in that files i have lines like

GenEddyVisc::correct(gradU);
updateSubGridScaleFields(gradU());

how or where can i find the definition of correct and update?

March 2, 2011, 14:38	thermo->correct	#1
Peter_600 Senior Member Join Date: Oct 2009 Posts: 140 Rep Power: 16	Hi at all What do those functions do? thermo->correct(); rho = thermo->rho(); Thanks Peter

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March 2, 2011, 18:16		#2
mturcios777 Senior Member Marco A. Turcios Join Date: Mar 2009 Location: Vancouver, BC, Canada Posts: 740 Rep Power: 28	Thermo->correct updates thermodynamic properties, thermo->rho calculates density based on the thermodynamic model.

March 3, 2011, 07:07		#3
Peter_600 Senior Member Join Date: Oct 2009 Posts: 140 Rep Power: 16	Thank you very much! When is it actually necessary to update thermodynamic properties? After mesh motion ? Topological changes? Does the thermo-> rho step replace my rhoeqn.H file? Thanks in advance Peter

March 4, 2011, 13:46		#4
mturcios777 Senior Member Marco A. Turcios Join Date: Mar 2009 Location: Vancouver, BC, Canada Posts: 740 Rep Power: 28	I guess it depends on what type of model you are running, but if you are solving energy/enthalpy/etc transport equations, then you need to update to thermodynamic properties. Temperature, density and transport properties (like alpha an mu) come from the thermodynamics. I looked at the definition of the correct() member function for hPsiThermo, and all it does is call calculate() which is defined in the following file: http://foam.sourceforge.net/doc/Doxy...8C_source.html (for OF 1.6) thermo.rho() returns the density based on pressure. As such it appears to overwrite the values of the field, but we still needed to solve a transport equation for rho, since most of the equations are coupled through rho.

April 1, 2019, 07:58		#5
manafaero New Member Manaf Muhammed Join Date: Oct 2018 Posts: 20 Rep Power: 7	Dear sir Could youplease tell me where can i find the definition of correct and update in openfoam. I am using Smagorinsky mode in incompressible LES . For eg in that files i have lines like GenEddyVisc::correct(gradU); updateSubGridScaleFields(gradU()); how or where can i find the definition of correct and update?