Re: [ff3d-users] running an example: temperature.ff

[Stephane Del Pino]

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Le jeudi 24 Juin 2004 01:59, Arun Viswanathan a écrit :
> Hi Stephane,
>
> I implemented all the changes you'd suggested --
> changed the mesh to a tetrahedrization (but still
> can't see any meshing or any results inside the
> geometry; the mesh is just better, with boxes and
> diagnoals) and also replaced C0=x*y*z with C0=0. My
> leakage sphere is now right in the center of the
> container. My visual now shows me high concentrations
> at the base of all the drums, as if the chemical is
> accumulating under the drums?! I have attached the .ff
> file with this mail. Please take a look at it and tell
> me what is wrong this time.
Dear Arun,

I have investigated your problem, and I have to say that I have no real 
explanation on what is going wrong. The trouble may come from the fact that 
the fictitious domain approximation generates oscillations around the drums 
that are then passed to the source term... But I am more likely thinking that 
this is a real bug, and it will unfortunately need more time to be solved :-(

I have performed some modifications of the POV geometry because you just 
described the drums bottom at the floor level which can result into bad 
numerical approximations. You will not that doing so, the red values are 
removed. But this is not enough to face your problem...

Anyway ff3d can still solve your problem, but you should consider creating a 
tetrahedral mesh that fits your geometry. Fortunately their are free 3D 
meshes generators available on the web:
        http://tetgen.berlios.de/
        http://www.geuz.org/gmsh/

I suggest you to look at them, letting me the time to try to understand where 
the problem comes from.

Best regards,
Stephane.
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case2conv.pov
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