# symetry B.C>

 Register Blogs Members List Search Today's Posts Mark Forums Read

 August 6, 2008, 21:09 symetry B.C> #1 Shuo Guest   Posts: n/a Hi I am simulating a free jet using Euler equations in the r-z plane. What are the boundary conditions for the symmetry plane and how do I implement it numerically? Cheers Shuo

 August 6, 2008, 21:34 Re: symetry B.C> #2 Ahmed Guest   Posts: n/a No mass flow across the Z axis.

 August 6, 2008, 21:37 Re: symetry B.C> #3 Shuo Guest   Posts: n/a what about the density and pressure?

 August 7, 2008, 00:47 Re: symetry B.C> #4 Ahmed Guest   Posts: n/a No jumps, there is no mass crossing the symmetry plane, also be carefull, no mass crossing means the normal component of the velocity vector is equal to zero, but the parallel componet is not. you can check the Peric or the Versteeg & Malalasekra books for full details. Good Luck.

 August 7, 2008, 02:49 Re: symetry B.C> #5 Praveen. C Guest   Posts: n/a If I understood correctly you are using cylindrical symmetry. Write the equations in r-z-theta coordinates and set all theta-derivatives and theta-velocity to zero. You will get an equation that looks almost like the 2-d equations but with some source terms.

 August 7, 2008, 09:58 Re: symetry B.C> #6 jinwon park Guest   Posts: n/a It is similar to the rigid wall boundary condition.

 August 8, 2008, 00:48 Re: symetry B.C> #7 Shuo Guest   Posts: n/a So its something like: v_0 = 0 u_0 = u_1 P_0 = P_1 rho_0 = rho_1 where u & v are the velocity components in the z and r directions respectively. 0 is the symmetry boundary and 1 is the nearest node. Shuo

 August 8, 2008, 00:50 Re: symetry B.C> #8 jinwon park Guest   Posts: n/a In my case where flow is axi-symmetric, I set like that. The implementation of axi-symmetric flows is very straightforward. The results of my axi-symmetric cases were right compared to the analyric solution or experimental data. Good luck!

 Thread Tools Display Modes Linear Mode

 Posting Rules You may not post new threads You may not post replies You may not post attachments You may not edit your posts BB code is On Smilies are On [IMG] code is On HTML code is OffTrackbacks are On Pingbacks are On Refbacks are On Forum Rules

 Similar Threads Thread Thread Starter Forum Replies Last Post jinwon park Main CFD Forum 7 March 6, 2008 05:56 Sherri FLUENT 1 January 12, 2006 13:32 Ray Hong FLUENT 0 December 28, 2005 20:35 Ray Hong FLUENT 0 December 28, 2005 07:03 Zou Chu Main CFD Forum 2 May 27, 1999 21:26

All times are GMT -4. The time now is 06:19.