[Nek5000-users] quasi 3D and boundary condition

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

Hi Zhang,

You can use periodic boundary conditions in the z direction, provided you have at least 3
elements in z.

Prescribed boundary conditions are given in Cartesian coordinates.  If you have the "mv "
bc on your moving surface (i.e., the cylinder surface), along with the following things

       lx2=lx1-2
       ly2=ly1-2
       lz2=lz1-2

 parameter (lx1m=lx1,ly1m=ly1,lz1m=lz1)

in SIZE, and T ifstrs, T ifmvbd in the .rea file, then the mesh will move with the fluid
velocity (which you prescribe as Cartesian velocity vectors, u,v,w).    Note that nek
uses an ALE formulation and the mesh motion must relatively limited or the mesh
becomes too distorted.   For an oscillating cylinder, this should be ok (see 
www.mcs.anl.gov/~fischer/ocyl.gif).    I've just added a 2D oscillating cylinder case
that illustrates the basic procedure to the examples suite.

Paul



________________________________________
From: nek5000-users-bounces at lists.mcs.anl.gov [nek5000-users-bounces at lists.mcs.anl.gov] on behalf of nek5000-users at lists.mcs.anl.gov [nek5000-users at lists.mcs.anl.gov]
Sent: Sunday, June 08, 2014 8:40 AM
To: nek5000-users at lists.mcs.anl.gov
Subject: [Nek5000-users] quasi 3D and boundary condition

Hi Everyone.
I am trying to run the flow past a cylinder case. I am going to move to the 3D simulation for my study. I have two questions:
1) how to run quasi 3D simulation in nek5000 ? if there is not existing code, andy suggestion to how to implement so?
2) how to specify the normal and tangential boundary condition for a curvature boundary?


cheers
----------------------------------------------
Zhang Wei
waynezw0618 at gmail.com



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