[Focus00000]

can anyone help me understand between fields and equations relaxation factors in fvSolutions
and which parameters (like k,U,P,epsilon etc) should be set in fields and which should be placed in equations for relaxation?????

[Andrea1984]

Hi Farhan,

the equation relaxation factors corresponds to the so-called implicit relaxation, whilst field corresponds to the explicit relaxation.

In both SIMPLE and PIMPLE the velocity is relaxed implicitly and the pressure explicitly, e.g.:

1.	relaxationFactors  
2.	{  
3.	    fields  
4.	    {  
5.	         p           0.4;  
6.	         pFinal      0.4;  
7.	    }  
8.	    equations  
9.	    {  
10.	         U           0.6;  
11.	         UFinal      0.6;  
12.	    }  
13.	}

As far as I am aware, there is no need to relax neither the velocity nor the pressure in the PISO algorithm.

Andrea