DNS 1-3 Quantification of Resolution: Difference between revisions
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= Quantification of resolution = | = Quantification of resolution = | ||
==Mesh resolution== | ==Mesh resolution== | ||
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|[[Image:DNS_1_3_taylor.png|740px]] | |[[Image:DNS_1_3_taylor.png|740px]] | ||
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|'''Figure 1:''' Stanford double diffuser, Alya DNS-250M DoF, Taylor microscale. | |'''Figure 1:''' Stanford double diffuser, Alya DNS-250M DoF, relation between the mesh size and the Taylor microscale. | ||
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<div id="figure2"></div> | <div id="figure2"></div> | ||
{|align="center" width=750 | {|align="center" width=750 | ||
|[[Image:DNS_1_3_delta_vs_eta.png|740px]] | |[[Image:DNS_1_3_delta_vs_eta.png|740px]] | ||
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|'''Figure | |'''Figure 2:''' Stanford double diffuser, Alya DNS-250M DoF, relation between the mesh size and the Kolmogorov length scale. | ||
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Revision as of 08:28, 18 November 2021
Quantification of resolution
Mesh resolution
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| Figure 1: Stanford double diffuser, Alya DNS-250M DoF, relation between the mesh size and the Taylor microscale. |
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| Figure 2: Stanford double diffuser, Alya DNS-250M DoF, relation between the mesh size and the Kolmogorov length scale. |
Solution verification
The 10000 Reynolds number diffuser has been run and compared with the results with previous DNS data performed by Ohlsson et al. (2010). A P2 mesh of 250 Million of DoF. The resolution is fine enough to be at DNS level. An animation of the fluctuations of this flow can be seen in fluctuations.
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| Figure 2: Stanford double diffuser, Re=10000, preliminary validation. Average streamwise velocity, Ohlsson et al. (2010) vs preliminary data obtained with Alya. |
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| Figure 3: Stanford double diffuser, Re=10000, preliminary validation. Average streamwise velocity fluctuations, Ohlsson et al. (2010) vs preliminary data obtained with Alya. |
In Fig. 2 and Fig. 3 results are presented with reference data from Ohlsson et al. (2010). Fair agreement is observed between both calculations, proving that the approach to be used in the present proposal is an optimal strategy. Turbulent inlet was generated in a precursor domain using a long enough duct with a roughness element to trigger the laminar to turbulent transition.
Contributed by: Oriol Lehmkuhl, Arnau Miro — Barcelona Supercomputing Center (BSC)
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