bugFreeFEM3D - Bugs: bug #6932, Not enough precise evaluation of...

 
 

bug #6932: Not enough precise evaluation of domain intersection.

Submitted by:  Stéphane Del Pino <delpinux>
Submitted on:  Tue 02 Dec 2003 09:00:33 PM UTC  
 
Category: NumericSeverity: 6 - Security
Item Group: NoneStatus: Fixed
Privacy: PublicAssigned to: Stéphane Del Pino <delpinux>
Open/Closed: Closed

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Fri 30 Jan 2004 06:07:05 PM UTC, comment #1:

This numerical unaccuracy has been fixed. A 4th order Laboatto quadrature formula is now used instead of the trapezoidal rule.
This should improve precision without deterioring too much the system conditioning: using a very accurate method can lead to such a illed-condition linear system that numerical errors lead to non-sens solutions --- this is due to the fictitious domain approach.

Stéphane Del Pino <delpinux>
Project AdministratorIn charge of this item.
Tue 02 Dec 2003 09:00:33 PM UTC, original submission:

The coefficient computed to evaluate the domain intersection with the border cells is evaluated in a very bad way that leads to an enormous pollution of the solution.

Stéphane Del Pino <delpinux>
Project AdministratorIn charge of this item.

 

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Follow 3 latest changes.

Date Changed By Updated Field Previous Value => Replaced By
Fri 30 Jan 2004 06:07:05 PM UTCdelpinuxStatusNone=>Fixed
  Open/ClosedOpen=>Closed
Tue 02 Dec 2003 09:00:33 PM UTCdelpinuxCarbon-Copy-=>Added j --DOT-- weimar --AT-- tu-bs --DOT-- de

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