Solving new implicit equation

Maxxxx · June 24, 2022, 03:08

Hey,

I`m wondering if there is a possibility to solve a implicit equation in fluent:

Code:

C1 * v + (v * nabla) v = C2

or in components

Code:

C1 * v_x + v * grad(v_x) = C2
C1 * v_y + v * grad(v_y) = C2
C1 * v_z + v * grad(v_z) = C2

where C1 and C2 are known constants and v is a vector field.

To get my v, I can form this to a semi-implicit equation system to remove the coupling of the three equations but I don´t know, how to solve them in fluent... In openFOAM I could just define a fvScalarMatrix let the solver do his work but for fluent I have no plan how to do.
I have also tried out to use the scalar transport equation but it does not work too.

Any ideas about this? Or is it better to solve this equations external?

Thanks in advance

Max

Maxxxx · July 6, 2022, 05:57

Hey, its me again.

Nobody has an idea?

June 24, 2022, 03:08	Solving new implicit equation	#1
Maxxxx New Member Max Join Date: Feb 2022 Posts: 8 Rep Power: 3	Hey, I`m wondering if there is a possibility to solve a implicit equation in fluent: Code: C1 * v + (v * nabla) v = C2 or in components Code: C1 * v_x + v * grad(v_x) = C2 C1 * v_y + v * grad(v_y) = C2 C1 * v_z + v * grad(v_z) = C2 where C1 and C2 are known constants and v is a vector field. To get my v, I can form this to a semi-implicit equation system to remove the coupling of the three equations but I don´t know, how to solve them in fluent... In openFOAM I could just define a fvScalarMatrix let the solver do his work but for fluent I have no plan how to do. I have also tried out to use the scalar transport equation but it does not work too. Any ideas about this? Or is it better to solve this equations external? Thanks in advance Max

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July 6, 2022, 05:57		#2
Maxxxx New Member Max Join Date: Feb 2022 Posts: 8 Rep Power: 3	Hey, its me again. Nobody has an idea?