Condition number

majkl · May 16, 2013, 08:04

Hi All,

is it possible to calculate condition number of the class fvMatrix? Well, I'm looking for some criteria, which would describe the conditionality of the equation system.

Thanks.

Michal

thomasArk47 · May 30, 2013, 18:50

Computing the condition number of a matrix requires computing eigenvalues. Computing eigenvalues of a big sparse matrix resulting from discretization of a mesh is somewhat also hard than solving Navier Stokes system.
Maybe you should say why you need such a computation. Are you really really sure it is necessary?

May 16, 2013, 08:04	Condition number	#1
majkl New Member Michal Join Date: Apr 2012 Location: Czech Republic Posts: 27 Rep Power: 13	Hi All, is it possible to calculate condition number of the class fvMatrix? Well, I'm looking for some criteria, which would describe the conditionality of the equation system. Thanks. Michal

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May 30, 2013, 18:50		#2
thomasArk47 Member Thomas Boucheres Join Date: May 2013 Posts: 41 Rep Power: 12	Computing the condition number of a matrix requires computing eigenvalues. Computing eigenvalues of a big sparse matrix resulting from discretization of a mesh is somewhat also hard than solving Navier Stokes system. Maybe you should say why you need such a computation. Are you really really sure it is necessary?