[Nek5000-users] plunging flat plate doesn't start

[nek5000-users at lists.mcs.anl.gov]

I successfully found the problem on my simulation. Now the plate starts 
its motion, but, simulations doesn't last for more than 3 or 4 
timesteps, since deformation of the mesh around the plate during the motion
leads on vanishing jacobian near the TE of the body. Since I only need a 
rigid motion, and I didn't found the possibility to run a simulation 
with a moving rigid grid, I changed reference of frame, running the 
simulation
in the body frame, and it is working very well.

Mario

On 09/14/2017 07:14 AM, nek5000-users at lists.mcs.anl.gov wrote:
> I am trying to simulate a plunging flat plate at various reduced 
> frequency and amplitude.
> I successfully played a fixed plate invested by a freestream flow, 
> with Wall conditions on the infintely thin plate, dirichelt upstream, 
> on the top and on the bottom and outlet downstream.
> Mesh is composed by six box around the plate.
> When I tried to switch on the plunging plate case, changing the Wall 
> condition to mv, I can't see the plate moving (I tried to increase 
> both frequency and amplitude, but I can't see the movement), and the 
> simulation, after
> two steps suddendly diverges. You can see in the attachement the box, 
> rea, usr map and SIZE I used. I need the vorticity field, and later 
> on, its time derivative, all over the fluid flow.
> Can you help me?
>
> Thanks, Mario
>
>
>
>
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-- 
Mario Ostieri

Ph.D. Student
University of Naples Federico II
Department of Industrial Engineering
Piazzale V. Tecchio 80
80125 Napoli, Italy
tel. +390817682184
email: mario.ostieri at unina.it

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