CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Main CFD Forum

SIMPLER Algorithm

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

Reply
 
LinkBack Thread Tools Display Modes
Old   July 5, 2008, 22:44
Default SIMPLER Algorithm
  #1
David
Guest
 
Posts: n/a
Hello.

I have some questions about the implementation of the SIMPLER algorithm outlined in Patankar's book, Numerical Heat Transfer and Fluid Flow.

I am implementing a one dimensional version with a uniform grid.

||-o-|-o-|-o-||

o shows where the pressure is calculated, | the velocity and || represents the given boundary velocities.

1) Do I use TDMA to calculate the pseudo velocities (u^)? Or do I just iterate through the array, calculating the coefficients (ap, aw, ae, b) and the pseudo velocity as I go?

2) When calculating the pressure field from the pseudo velocity values,the coefficients aE and aW include ae and aw.

aE = density * (Area / ae) *Dy *Dz

But since the grid is staggered ae does not exist at the point P, where the pressure is calculated. Am I meant to use ap from the point ue (the neighbouring velocity)?

3) In the grid setup shown, there is no boundary pressure value. When I start the TDMA process for pressure, there is no aW coefficient (ie c1 = 0 in the TDMA notation used in the book) and P1 is consequently equal to 1. This means that all subsequent values of Pi are also 1. Is this correct? It doesn't seem like it can be as on the far boundary aE does not exist and QN involves a division by zero.

4) Since I am assuming an incompressible fluid, the density never changes and so terms like (d0 - d) become zero. Is this correct?

Thankyou to anyone who can help me with this.

  Reply With Quote

Old   July 13, 2008, 12:18
Default Re: SIMPLER Algorithm
  #2
ztdep
Guest
 
Posts: n/a
pressure is calculated at the main point. the boundary of pressure is the second kind. i can help you,please further contack. ztdep@yahoo.com.cn
  Reply With Quote

Reply

Thread Tools
Display Modes

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 Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
SIMPLER Algorithm Bharath Main CFD Forum 2 July 10, 2009 10:53
Pressure BC in SIMPLER Algorithm? Mori Main CFD Forum 1 August 24, 2006 18:45
Interpolation algorithm in SIMPLER elisabet Main CFD Forum 0 December 7, 2005 04:54
SIMPLER Algorithm question Erik Main CFD Forum 1 May 23, 2004 03:57
SIMPLER ALGORITHM H.Setthapong Main CFD Forum 5 October 18, 2000 06:34


All times are GMT -4. The time now is 01:49.