[dinhanh]

Hi,

In my problem, there is a point that lie in both wall and symetric axis as in the picture. Normally, for the point on the wall, I used the no lip con dition and normal grdient of variable is zero. For the symetric axis, I used the condition similar to symetric line BC. However, at the point in both symetric and wall, the point A(i,j) in picture, if using normal gradient = zero, it mean pA=pD. But it look incorrect because A is the stagnation point. So the pressure at A must be > at D.

How do the condition for the point A specify?

[piu58]

Boundary conditions has to be set on patches, not on points.

[dinhanh]

I am using finite difference method. So I think the point value must be specified

[FMDenaro]

The point is on the wall, prescribe no-splip BC.s. If you are solving incompressible flow, pressure is not fixed but determined by Neumann Bc.s

[sbaffini]

That really has no practical difference within your grid resolution accuracy.

Still, I would choose WALL too.

P.S. Weird grid for a finite difference application, how do you handle the non-axis-aligned boundary and related grid lines?

[dinhanh]

Hi, Sabaffini

"P.S. Weird grid for a finite difference application, how do you handle the non-axis-aligned boundary and related grid lines?"

I dont understand your question?

[sbaffini]

It was the expression of a genuine curiosity. I mean, do you have a sort of jacobian and work within the computational space? Any particular reason for not choosing the fv method instead?