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atwhaley / cfast

Automatically exported from code.google.com/p/cfast
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Stalling on lack of pressure solution #16

Closed GoogleCodeExporter closed 9 years ago

GoogleCodeExporter commented 9 years ago 
File name:  DOE095a

Summary:  Stalling on lack of pressure solution

Attached file was run from the CEdit GUI.  CFAST stalls 151 seconds.  

CEdit Error window states:

Log: ERROR, DASSL - IDID= -8
Log:  pressure in room  1
Log:  Solution component with the greatest error is
Log: ierror,r1,r2 =  660    0.1516D+03    0.8408D-03
Log: AT T (=R1) AND STEPSIZE H (=R2) THE ITERATION MATRIX IS SINGULAR

Stalling on a 200 kW fire in a 3.6 m by 2.0 m room with door gap and 
forced ventilation is unexpected.

Version 6.1.0.24

If the door soffit is increased from 0.01 to 0.011 problem runs to 
solution.

Original issue reported on code.google.com by allan.co...@wsms.com on 18 Jan 2008 at 12:12

Attachments:

GoogleCodeExporter commented 9 years ago

Original comment by cfastdev@gmail.com on 11 Feb 2008 at 6:40

GoogleCodeExporter commented 9 years ago 
We are currently working a similar issue in the most recent version of CFAST 
related to pressure convergence. This is an older issue and the input file is 
outdated. If you post an updated input file that exhibits the same problem, we 
can take a look.

Original comment by koverholt on 21 Aug 2013 at 3:19