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Forum: Main CFD Forum

August 3, 2011, 19:04

Replies: 8

Block Tridiagonal and Block Bidiagonal solver

Views: 5,574

Posted By arjun

I give you that inverting 3x3 matrix is not very...

I give you that inverting 3x3 matrix is not very expensive. But it seems you missed my point. Which was Thomas algorithm is not very efficient for general block tridiagonal system. It could be used...

Forum: Main CFD Forum

August 3, 2011, 17:46

Replies: 8

Block Tridiagonal and Block Bidiagonal solver

Views: 5,574

Posted By arjun

If take say mesh of 1000 x 1000 ( or say n x m...

If take say mesh of 1000 x 1000 ( or say n x m )and discretesize Poisson problem on it.

The operation count in block cyclic reduction is roughly nmlog(m) .

But if you use the method of...

Forum: Main CFD Forum

August 2, 2011, 17:34

Replies: 8

Block Tridiagonal and Block Bidiagonal solver

Views: 5,574

Posted By arjun

This is based on Thomas' algorithm so in case of...

This is based on Thomas' algorithm so in case of block matrices it is NOT efficient. If your case is large lets say block of 2000 * 2000 , it will take lot of time.

If possible one should try...

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