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Title: | Validating LES of the flow in the development section of a boundary layer wind tunnel | Authors: | Joerg Franke J. T.H. Pham |
Keywords: | Validating LES;Boundary layer;Wind tunnel | Issue Date: | 2017 | Source: | https://auckland.figshare.com/apcwe9 | Conference name: | The 9th Asia-Pacific Conference on Wind Engineering | Abstract: | In this study, validation results for the Large Eddy Simulation of the flow in the development section of a boundary layer wind tunnel are presented. The simulation in the empty wind tunnel with vortex generators and roughness elements is a precursor simulation to generate time–dependent inflow boundary condition for a city model investigated in the wind tunnel. Mean velocities and Reynolds stresses are compared at measurement positions located behind the roughness elements with the validation metric hit rate. For the streamwise velocity a hit rate of at least 0.634 is obtained, while the agreement for the lateral and vertical velocity components is much lower, with 0.104 and 0.000, respectively. The bad agreement is attributed to using a coarse mesh at walls without wall functions. A slightly better agreement is obtained when comparing simulation results at the location for sampling velocities within the roughness elements and the measurement locations behind the roughness elements. As the comparison of velocity spectra also indicate a good agreement at frequencies up to the cut–off frequency, it is nevertheless concluded that the sampled data can be used as inflow boundary condition for the Large Eddy Simulation of the flow in the generic city model. |
Duration: | 03-07/12/2017 | Conference venue: | Auckland, New Zealand | URI(1): | http://epub.vgu.edu.vn/handle/dlibvgu/210 |
Appears in Collections: | Conference papers |
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