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Forum: Main CFD Forum

April 12, 2013, 04:17

Replies: 6

Fractional steps method

Views: 1,298

Posted By FMDenaro

on a wall n.Vn+1 must be prescribed ... some...

on a wall n.Vn+1 must be prescribed ... some difficulties can appear for an outlet where you have to prescribe some condition derived by physical assumption

Forum: Main CFD Forum

April 12, 2013, 03:20

Replies: 6

Fractional steps method

Views: 1,298

Posted By FMDenaro

The equation is: Div (Grad (phi)) = Div V* ...

The equation is:

Div (Grad (phi)) = Div V* (1)

with the BCs:

d phi/dn = n . (V* - Vn+1) -> n . V* = d phi/dn - n . Vn+1

then substitute in RHS of (1) and simplify the terms

Forum: Main CFD Forum

March 8, 2012, 13:44

Replies: 6

Fractional steps method

Views: 1,298

Posted By FMDenaro

once computed the intermediate non-solenoidal...

once computed the intermediate non-solenoidal field you use the Hodge decomposition

V* = Vn+1 + Grad (phi)

Taking divergence of both sides you get

Div (Grad (phi)) = Div V*

with the BCs:

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