# Tobi

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## How to calculate the polynomial coefficients of any arbitrary polynomial to fit data

Posted August 1, 2016 at 08:06 by Tobi

Dear all,

if you are interested in the calculation of polynomial coefficients to fit some data, you can check the method of least squares on my homepage. Here I explained everything in detail and also gave an example how to build the matrix A and the solution vector b for the problem we are discussing there. The polynomial that I am using in the example is:

How to build the matrix A and the solution vector...
Senior Member
Posted in Uncategorized

## divDevRhoReff and divDevReff

Posted July 15, 2015 at 15:24 by Tobi
Updated January 19, 2016 at 06:38 by Tobi

Hi all,

I removed that blog post because now everything is available here: http://holzmann-cfd.de/index.php/en/publications

There it is more clear and straight forward.

If you want to give me some reputation please use that thread for that:

http://www.cfd-online.com/Forums/ope...-openfoam.html
Senior Member
Posted in Equations

## All about the PIMPLE algorithm - Part II

Posted October 21, 2014 at 17:55 by Tobi
Updated September 28, 2016 at 05:04 by Tobi (Some errors and mistakes)

## Case 3.1 ##

Now we will use the following fvSolution file:
Code:
PIMPLE
{
nCorrectors            1;
nOuterCorrectors    2;
}
Compared to Case 2 there is not a big difference. The only difference is that we calculate the pressure - momentum coupling in one time step twice:
1. Calculate momentum
2. Calculate pressure
3. Recalculate momentum from new pressure
4. Recalculate pressure from new momentum
Calculation in OpenFOAM is like:...
Senior Member

## All about the PIMPLE algorithm - Part I

Posted October 21, 2014 at 17:54 by Tobi
Updated October 3, 2016 at 17:27 by Tobi

#### New explanation (03.10.16) ####
If you are interested in the PIMPLE algorithm and need some reference, you can check out my book which is now extended by 23 new pages, where I explain the PIMPLE algorithm like I do here.

#### Storyboard ####

First I wanted to write a nice story like »Ignaz« but that would only copy the good attention of the author and of course I am not a good story-teller. Therefore I will go directly to the topic and will tell you how...
Senior Member

## Influence of mesh size, orientation and type on numerical schemes

Posted July 27, 2014 at 11:13 by Tobi
Updated July 28, 2014 at 04:46 by Tobi

Dear Community,

I am happy and glad to tell you that I finished to analyze all my cases in the investigation of the "Influence of mesh size, orientation and type on numerical schemes in a convective flow field".

Information

• Investigate into numerical schemes to convective flow field
• Influence of schemes on mesh size
• Influence of schemes on mesh type (structured / unstructured)
• Influence of schemes on mesh/flow orientation (45degree / 0 degree)
...
Senior Member