fvVectorMatrix, trying to understand

shereez234 · February 12, 2020, 02:45

Code:

fvVectorMatrix UEqn
(
    fvm:ddt(U) 
+  fvm::div(phi,U)
    ==
    fvOptions(U)
)

Hi, so i am trying to understand how this Matrix is implemented in terms of C++ programming.
my question:
is this implementation taking operator overloading in the constructor definition of the fvVectorMatrix class?
Can anyone provide any insight?

Ultimate purpose being trying to implement an equation of this kind in a 2D CFD code i am writing.

Kind regards
M Sereez

santiagomarquezd · April 3, 2020, 14:03

Hi, take a look of gdbOF.

Regards!

Rvadrabade · April 5, 2020, 15:32

Yes.
Temporary fvVectorMatrix is created for each terms and with overloaded operators are used to make single temporary fvVectorMatrix and the fvVectorMatrix is created.

Quick tip:- Use doxygen:- https://www.openfoam.com/documentati...doc/index.html

Find functions, observe parameters and return type and constructors.

February 12, 2020, 02:45	fvVectorMatrix, trying to understand	#1
shereez234 Senior Member M Sereez Join Date: Jan 2014 Location: England Posts: 352 Blog Entries: 1 Rep Power: 13	Code: fvVectorMatrix UEqn ( fvm:ddt(U) + fvm::div(phi,U) == fvOptions(U) ) Hi, so i am trying to understand how this Matrix is implemented in terms of C++ programming. my question: is this implementation taking operator overloading in the constructor definition of the fvVectorMatrix class? Can anyone provide any insight? Ultimate purpose being trying to implement an equation of this kind in a 2D CFD code i am writing. Kind regards M Sereez nepomnyi likes this.

April 3, 2020, 14:03		#2
santiagomarquezd Senior Member Santiago Marquez Damian Join Date: Aug 2009 Location: Santa Fe, Santa Fe, Argentina Posts: 452 Rep Power: 23	Hi, take a look of gdbOF. Regards! Rvadrabade likes this. __________________ Santiago MÁRQUEZ DAMIÁN, Ph.D. Research Scientist Research Center for Computational Methods (CIMEC) - CONICET/UNL Tel: 54-342-4511594 Int. 7032 Colectora Ruta Nac. 168 / Paraje El Pozo (3000) Santa Fe - Argentina. http://www.cimec.org.ar

April 5, 2020, 15:32	fvVectorMatrix construction	#3
Rvadrabade Member Rahul Vadrabade Join Date: Apr 2018 Posts: 46 Rep Power: 8	Yes. Temporary fvVectorMatrix is created for each terms and with overloaded operators are used to make single temporary fvVectorMatrix and the fvVectorMatrix is created. Quick tip:- Use doxygen:- https://www.openfoam.com/documentati...doc/index.html Find functions, observe parameters and return type and constructors. Last edited by Rvadrabade; April 6, 2020 at 00:48.

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