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TWiki> Main Web>TsfpPaper (2011-05-05, RuggeroPoletto)

TWiki> Main Web>TsfpPaper (2011-05-05, RuggeroPoletto)

All the data and graphs on this page are obtained for a Channel flow %$ Re_\tau = 395 $%, where inlet condition are generated by using different methods and imposing as velocity/Reynolds stresses profiles Moser and alt. DNS data!
## PAPER tex and pdf

## Comparison

## Applied ReyStress

## DF-SEM

## SEM

## Vortex (Sergeant)

## Energy Spectrum (Davidson)

Here you are the links to the tex file tsfp_paper_final.tex and to the pdf tsfp_paper_final.pdf of

the paper (obviously they are still only drafts!!!!)!! I have uploaded the summary page as well!SummaryTSFP.pdf

NOTE: CHECK OUT THIS PAGE FOR THE 2DHUMP RESULTS!!!

CF of DF-SEM with sigma and Rey obtained at cells center!

In case of a redistribution only among uu and vv:

uv is again under-estimated because:

%$ uv = \lambda_1 r_{11} r_{12} + \lambda_2 r_{21} r_{22} $%

where %$ r_{11} r_{12} = - r_{21} r_{22} = \alpha $%.

When %$ \lambda_{i} $% is rescaled we have: %$ \lambda_{1r} = \lambda_{1} - \beta $% and %$ \lambda_{2r} = \lambda_{2} + \beta $%.

The new uv is then:

%$ uv = \lambda_{1r} r_{11} r_{12} + \lambda_{2r} r_{21} r_{22} = (\lambda_{1} - \beta) \alpha + (\lambda_{2} + \beta) (-\alpha) = uv - 2 \beta \alpha $%

The simulation did not show any improvement respect to the ones where the redistribution of the kinetic energy involves all the directions!

It is then impossible to obtain the same level of shear stress without changing the turbulent kinetic energy! At the moment I am trying to run a simulation where, with a different turbulent kinetic energy, I manage to reproduce exactly the shear stress!

**Update**: after a while I managed to demonstrate that in our conditions (decrease the value of one normal stress and increase all the others) it *is impossible* to keep constant the shear stress, even in a 2D problem!

The last interesting simulation that I am running at the moment is the one with the following ReyStress :

I | Attachment | Action | Size | Date | Who | Comment |
---|---|---|---|---|---|---|

SummaryTSFP.pdf | manage | 343.8 K | 2011-04-26 - 11:02 | RuggeroPoletto | ||

tsfp_paper_final.pdf | manage | 644.7 K | 2011-05-05 - 14:56 | RuggeroPoletto | ||

tex | tsfp_paper_final.tex | manage | 29.8 K | 2011-05-05 - 14:48 | RuggeroPoletto | |

tsfp_template.pdf | manage | 522.8 K | 2011-04-27 - 14:15 | RuggeroPoletto | ||

tex | tsfp_template.tex | manage | 27.3 K | 2011-04-27 - 14:16 | RuggeroPoletto |

Topic revision: r19 - 2011-05-05 - 14:56:44 - RuggeroPoletto

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