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-   -   Temporal discretisation of spatial derivatives in pisoFoam - Implicit or Explicit? (https://www.cfd-online.com/Forums/openfoam-programming-development/136496-temporal-discretisation-spatial-derivatives-pisofoam-implicit-explicit.html)

HakikiCanakkaleli May 29, 2014 14:42
Temporal discretisation of spatial derivatives in pisoFoam - Implicit or Explicit?
 
Hi

==1==
I have always supposed that temporal discretisation of spatial derivatives in pisoFoam is implicit.

I have, however, realized that, the spatial derivatives are solved in an explicit manner if I correctly understood the following term:

==2==
In the standard pisoFoam of OF version 2.2.x:

Code:
solve( UEqn == -fvc::grad(p) )
==3==
I would really appreciate any comments on this.

Many thanks.

ngj May 29, 2014 15:55
Hallo,

It is only the pressure gradient, which is explicit in that line of code. pisoFoam applies a segregated approach to the pressure-velocity coupling, so the pressure cannot be treated implicitly in an equation for the velocity.

Kind regards,

Niels


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