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Forum: OpenFOAM Community Contributions

March 7, 2013, 14:09

Replies: 18

[swak4Foam] how to initialize a random velocity field with funkySetFields

Views: 6,038

Posted By gschaider

Write your own random-number-generator (using...

Write your own random-number-generator (using some text-book implementation). Using the function-plugin-facility you can also use it as "randomAlbert(2)" (or "albertRandom(22)" if you prefer) in your...

Forum: OpenFOAM Community Contributions

March 6, 2013, 05:41

Replies: 18

[swak4Foam] how to initialize a random velocity field with funkySetFields

Views: 6,038

Posted By gschaider

Well. rand() uses the Random-class of OpenFOAM...

Well. rand() uses the Random-class of OpenFOAM which in turn uses the random-number generator of the operating system. These generators used to have a bad reputation in terms of the periodicity.
...

Forum: OpenFOAM Community Contributions

February 21, 2013, 11:23

Replies: 18

[swak4Foam] how to initialize a random velocity field with funkySetFields

Views: 6,038

Posted By gschaider

Fix by update. Great My bad. That has...

Fix by update. Great

My bad. That has already changed for some time. Now there are two functions: rand(42) which changes during time and randFixed(42) which doesn't

That case can be...

Forum: OpenFOAM Community Contributions

February 20, 2013, 11:46

Replies: 18

[swak4Foam] how to initialize a random velocity field with funkySetFields

Views: 6,038

Posted By gschaider

Pleas put output in CODE not QUOTE. That way the...

Pleas put output in CODE not QUOTE. That way the spaces are preserved and I don't have to guess where the ^^ are pointing at

Which version of swak do you use?

Forum: OpenFOAM Community Contributions

January 10, 2013, 09:10

Replies: 18

[swak4Foam] how to initialize a random velocity field with funkySetFields

Views: 6,038

Posted By gschaider

That was fast:...

That was fast: http://openfoamwiki.net/index.php/Contrib/swak4Foam/Example_initRandomVelocity

Great. If everyone who got his question answered did this then there wouldn't be a documentation...

Forum: OpenFOAM Community Contributions

January 10, 2013, 06:23

Replies: 18

[swak4Foam] how to initialize a random velocity field with funkySetFields

Views: 6,038

Posted By gschaider

Would be nice if you could add an example to...

Would be nice if you could add an example to http://openfoamwiki.net/index.php/Contrib/swak4Foam#Usage_examples (I'm trying to get people to contribute such things that are commonly used in a central...

Forum: OpenFOAM Community Contributions

January 9, 2013, 16:49

Replies: 18

[swak4Foam] how to initialize a random velocity field with funkySetFields

Views: 6,038

Posted By gschaider

But it is used by it ;) To create...

But it is used by it ;)

To create reproducible results random always uses the same seed. But you can change that by simply supplying an integer "random(42)" for instance. If you do that for every...

Forum: OpenFOAM Community Contributions

January 5, 2013, 18:01

Replies: 18

[swak4Foam] how to initialize a random velocity field with funkySetFields

Views: 6,038

Posted By gschaider

Of course it is. All you've go to do is do a...

Of course it is. All you've go to do is do a simple transformation of the range [0,1) to the range [-0.005,0.005) which is done with <drumroll> "0.01*rand()-0.005" (I think it shouldn't be too hard...

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