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What happens by doing Bandwidth Reduction?

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Old   January 29, 2010, 12:50
Question What happens by doing Bandwidth Reduction?
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Hey friends,

In fluent, what happens when u do bandwidth reduction by grid>reorder>domain

Why and when do u do it?

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Old   January 30, 2010, 13:52
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After you read your mesh in Fluent you can do the bandwidth reduction. Basically Fluent will renumber the nodes of your mesh in order to have a "more diagonal" array. This will allow you to use less memory and also the solution will converge faster.

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Old   January 31, 2010, 06:25
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Hey DoHander,

So basically, it means that one should make it a practice to always do bandwidth reduction after reading any mesh into Fluent...
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Old   January 31, 2010, 13:54
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If you use any of the implicit solvers of Fluent yes, you should always do the bandwidth reduction. For the explicit solver this is useless.

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Old   February 1, 2010, 12:26
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Thanks DoHander
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Old   February 28, 2013, 06:24
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I also have a question on this, till what value you need to reorder to achieve the most optimal bandwidth? Seem to me that the lower the bandwidth value the better?
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Old   April 15, 2014, 02:32
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Quote:
Originally Posted by daandb View Post
I also have a question on this, till what value you need to reorder to achieve the most optimal bandwidth? Seem to me that the lower the bandwidth value the better?
Yup, lower the bandwidth value the better the solution will get in terms of solution time!! But you cannot control the value to which the bandwidth (of matrix) can be reduced, as it depends on the number of non-zero entries in the matrix(the matrix generated as the fluent solves the N-S equations)
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Old   July 19, 2014, 05:59
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details can be found here...

http://en.wikipedia.org/wiki/Banded_matrix

This also clearly shows why you cannot have advantage of reordering for explicit solver...
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Old   July 19, 2014, 06:05
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details can be found here...

http://en.wikipedia.org/wiki/Banded_matrix

This also clearly shows why you cannot have advantage of reordering for explicit solver...
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