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Abstract

The present test case was designed to investigate the effect of an adverse pressure gradient on a turbulent boundary layer. The problem considers the flow over a 2D smooth bump geometry, see, Fig. 1, defined at UFR_X-YZ_Test_Case and inspired by the axisymmetric one proposed by Disotell and Rumsey.

At the inlet a Blasius profile with Re_x=6500000 for the velocity a uniform profile for static pressure and uniform profile for total temperature are imposed. At the outlet, a standard Dirichlet condition for the pressure is prescribed. At the upper boundary a freestream condition is set. The Reynolds number is Re= 78490 and is based on freestream properties and bump height. The flow is considered compressible with Mach number based on freestream properties equal to Ma=0.13455.

The dataset concerns the scale-resolving simulation of the turbulent flow over a smooth bump using the high-order discontinuous Galerkin (DG) code MIGALE [3]. The code couples the high-order DG spatial discretization with high-order implicit time integration using Rosenbrock-type schemes, here of the fifth order [4,5]. The primary objective of this contribution is to provide a rich database of flow and turbulence statistics for verification and validation on subsequent computational campaigns.

The provided statistical quantities in the database are:

• mean pressure, temperature, density and velocity components;
• Favre averaged velocity and temperature;
• mean shear stress and heat flux;
• Reynolds stress components;
• Reynolds stress equations budget terms;

WIP …

• pressure, temperature and density autocorrelations;
• Taylor microscale;
• Kolmogorov length and time scales;
• velocity Favre triple correlation;
• pressure-velocity correlation;
• shear stress-velocity correlation;
• triple velocity correlation;
• Difference between the Renynolds and the Favre average.

References

[1] K. J. Disotell and C. L. Rumsey. Modern cfd validation of turbulent flow separation on axisymmetric afterbodies.

[2] K. J. Disotell and C. L. Rumsey. Development of an axisymmetric afterbody test case for turbulent flow separation validation. NASA/TM-2017219680, Langley Research Center, Hampton, Virginia, 2017.

[3] Bassi, F., Botti, L., Colombo, A. C, Ghidoni, A., Massa, F., "On the development of an implicit high-order Discontinuous Galerkin method for DNS and implicit LES of turbulent flows” Bassi, F., Botti, L., Colombo, A., Crivellini, A., Ghidoni, A., Massa, F. European Journal of Mechanics, B/Fluids, 2016, 55, pp. 367–379

[4] Di Marzo, G., “RODAS5(4) - Méthodes de Rosenbrock d'ordre 5(4) adaptées aux problèmes différentiels-algébriques", MSc Mathematics Thesis, Faculty of Science, University of Geneva, 1993

[5] Bassi, F., Botti, L., Colombo, A., Ghidoni, A., Massa, F., “Linearly implicit Rosenbrock-type Runge-Kutta schemes applied to the Discontinuous Galerkin solution of compressible and incompressible unsteady flows”, Computers and Fluids, 2015, 118, pp. 305–320

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Contributed by: Francesco Bassi, Alessandro Colombo, Francesco Carlo Massa — Università degli studi di Bergamo (UniBG)

Front Page

Description

Computational Details

Quantification of Resolution

Statistical Data

Instantaneous Data

Storage Format

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