# Boundary Conditions Validity

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

January 14, 2014, 01:16
Boundary Conditions Validity
#1
Member

Osman
Join Date: Oct 2012
Location: Japan
Posts: 51
Rep Power: 6
Is the boundary condition applied in this system is valid ??
I am using staggered grid & fractional step method to solve Incompressible NS Eqs.
Attached Images
 Question CFD.jpg (8.0 KB, 26 views)

 January 15, 2014, 18:18 #2 Member   Join Date: Jun 2011 Posts: 51 Rep Power: 7 Greetings, I do not really understand what you want to test. It looks like you will be able to simulate nothing! Regards,

January 15, 2014, 21:25
#3
Member

Osman
Join Date: Oct 2012
Location: Japan
Posts: 51
Rep Power: 6
Quote:
 Originally Posted by cfdivan Greetings, I do not really understand what you want to test. It looks like you will be able to simulate nothing! Regards,
There is an oscillating body inside the domain, which will cause an oscillating flow.

 January 18, 2014, 13:53 #4 Member   Ashwani Join Date: Sep 2013 Location: Hyderabad Posts: 99 Rep Power: 5 The Dirichlet pressure boundary condition we can apply only when the flow will be fully developed at the outlet.

January 18, 2014, 13:54
#5
Member

Osman
Join Date: Oct 2012
Location: Japan
Posts: 51
Rep Power: 6
Quote:
 Originally Posted by AshwaniAssam The Dirichlet pressure boundary condition we can apply only when the flow will be fully developed at the outlet.
Based on Re the Channel is long enough to assure fully developed flow at both ends.

 January 18, 2014, 14:57 #6 Member   Ashwani Join Date: Sep 2013 Location: Hyderabad Posts: 99 Rep Power: 5 The boundary condition then seems fine. Since, the oscillating body inside will be something like the source term for Navier-Stokes. Also, how you are giving these oscillating conditions.

January 18, 2014, 15:06
#7
Member

Osman
Join Date: Oct 2012
Location: Japan
Posts: 51
Rep Power: 6
Quote:
 Originally Posted by AshwaniAssam The boundary condition then seems fine. Since, the oscillating body inside will be something like the source term for Navier-Stokes. Also, how you are giving these oscillating conditions.
Immersed Boundary Method (IBM)

 January 18, 2014, 17:03 #8 Senior Member   Vino Join Date: Mar 2013 Location: India Posts: 115 Rep Power: 5 As far as I know, At inlet (velocity to be specified, pressure to be interpolated) and At outlet (velocity to be specified, pressure to be interpolated) for Incompressible flows. Since I am not working with fractional step method, I don't know whether you can use Pressure boundary condition on both inlet and outlet.

 January 18, 2014, 23:20 #9 Member   Osman Join Date: Oct 2012 Location: Japan Posts: 51 Rep Power: 6 I am still waiting for any one (has experience) to confirm weather i can or can't use these BC !!!

 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 Anindya Main CFD Forum 25 February 27, 2016 13:58 Anna Tian CFX 1 June 16, 2013 06:28 lost.identity CFX 41 May 22, 2013 07:21 vaina74 Open Source Meshers: Gmsh, Netgen, CGNS, ... 2 May 27, 2010 09:38 michele OpenFOAM Other Meshers: ICEM, Star, Ansys, Pointwise, GridPro, Ansa, ... 2 July 15, 2005 04:15

All times are GMT -4. The time now is 19:03.