UFR 3-36 Evaluation: Difference between revisions

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The RANS simulations described in a previous section are compared and assessed to uDNS computation results preformed by UNIBG. The setup and results of this uDNS computation can be found under [[Lib:DNS 1-5|Lib:DNS 1-5]].   
The results of the RANS simulations described in a previous section are compared here with the uDNS-computation results preformed by UNIBG. The setup and results of this uDNS computation can be found under [[Lib:DNS 1-5|Lib:DNS 1-5]].   
== Comparison of uDNS results with RANS results ==
== Comparison of uDNS results with RANS results ==


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!align="center" colspan="2"|Figure 5: Streamwise (<math>\overline{u'u'}</math>), wall-normal (<math>\overline{v'v'}</math>), shear-stress (<math>-\overline{u'v'}</math>) and turbulent kinetic energy (k) profiles. Solid line: uDNS, dashed line: SSGLRR-<math>\omega</math>
!align="center" colspan="2"|Figure 5: Streamwise (<math>\overline{u'u'}</math>), wall-normal (<math>\overline{v'v'}</math>), shear-stress (<math>-\overline{u'v'}</math>) and turbulent kinetic energy (k) profiles. Solid line: uDNS, dashed line: SSGLRR-<math>\omega</math>
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A discussion of the results presented here is given in the Best Practice Advice section.





Revision as of 10:06, 17 February 2023

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Description

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Evaluation

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Semi-confined flows

Underlying Flow Regime 3-36

Evaluation

The results of the RANS simulations described in a previous section are compared here with the uDNS-computation results preformed by UNIBG. The setup and results of this uDNS computation can be found under Lib:DNS 1-5.

Comparison of uDNS results with RANS results

Figure3 cf.png Figure3 cp.png
Figure 3: Skin friction and pressure coefficient on the body wall. Solid line: uDNS, dashed line: SSGLRR-, dashdotted line: k-

Non-dimensional quantities:

  • Pressure coefficient:
  • Skin-friction coefficient:

with the wall pressure , the freestream pressure , the freestream density , the freestream velocity and the wall shear stress .


Figure4 uUin.png Figure5 vUin.png
Figure 4: Streamwise (u) and wall normal (v) velocity profiles along x-axis. Solid line: uDNS, dashed line: SSGLRR-, dashdotted line: k-
Wiki Ruu DLR UniBG DNS mod1.png Wiki Rvv DLR UniBG DNS mod1.png
Wiki Ruv DLR UniBG DNS mod1.png Figure5 k.png
Figure 5: Streamwise (), wall-normal (), shear-stress () and turbulent kinetic energy (k) profiles. Solid line: uDNS, dashed line: SSGLRR-

A discussion of the results presented here is given in the Best Practice Advice section.





Contributed by: Erij Alaya and Cornelia Grabe — Deutsches Luft-und Raumfahrt Zentrum (DLR)

Front Page

Description

Test Case Studies

Evaluation

Best Practice Advice

References


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