[Letan]

Hello,

I am trying to simulate the pressure around a low-rise building with eaves and openings.
In the case where there's NO OPENING yet, (i.e. wind flow around
a closed building), I expect no relative pressure developing inside the building (UNDEFINED).However,
as I accidentally probed inside the building and near the walls and roof, I am getting
pressure and velocity values. So, to investigate further, I tried plotting the pressure
and velocity contour on a cutting plane and you can see that in the attached picture.

Can someone kindly explain why so?
By the way, I didn't use the ENCLOSURE tool since it requires a certain distance between the
building and the ground. So I simply created a box wherein its ground coincides with the base
of the building then used BOOLEAN to create the Fluid Environment. I initially thought this was
the problem so I ran another case using Enclosure with 5 mm gap between the base and the ground.
Still I'm getting pressure and velocity values inside the building near the walls.

My ultimate concern is if this issue will affect the pressure values near the walls and roof inside the building when I'm considering openings.

Thank you for taking time to help out!

[-Maxim-]

could you also post a picture of your mesh, please? Have you defined the boundaries around the house correctly? As a 'wall'?

[ghorrocks]

Have you defined the house as an immersed solid? If so you should not do that, it should be a cavity in the mesh domain.

[Letan]

Hello Maxim,

I will get back to you with the picture of the mesh... but with regards to the boundary condition, YES i did assign a WALL - No Slip .

[Letan]

Hello Ghorrocks,

This can be found in the CFX-Pre right? I looked at the Domain Type and I already defined it as Fluid Domain (other options include solid, porous and immersed solid).