MODELING OF AN ATMOSPHERIC-BOUNDARY-LAYER PROFILE IN SUPPORT OF EXPERIMENTS IN THE NASA LANGLEY TRANSONIC DYNAMICS TUNNEL

Pawel Chwalowski, Thomas G. Ivanco

DOI Number: N/A

Conference number: IFASD-2019-027

This paper presents the results of the Computational Fluid Dynamics (CFD) analyses to model two atmospheric-boundary-layer (ABL) proﬁles inside the NASA Langley Research Center Transonic Dynamics Tunnel (TDT). The CFD models include tunnel walls and all additional hardware needed to simulate the ABL proﬁles. This hardware includes Irwin spires and ﬂoor-mounted roughness elements. The numerical simulations show that the application of higher-ﬁdelity numerical methods is necessary to compute boundary-layer and turbulenceintensity proﬁles that match experimental data. The ABL proﬁles are computed both inside the numerical model of the TDT and in a classical free-air model. Both Unsteady ReynoldsAveraged Navier-Stokes (URANS) with Spalart-Allmaras (SA) turbulence model and Modiﬁed Delayed Detached Eddy (MDDES) simulation methods are used. The results show that the MDDES-simulation results match the experimental data very well while URANS-SA does not. The results also show that the wind-tunnel walls have a signiﬁcant effect on ABL prediction.

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ABL, CFD, FUN3D, MDDES, TDT, Unsteady aerodynamics

In Categories: IFASD 2019, Unsteady CFD

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