DNS 1-5: Difference between revisions
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* Difference between the Renynolds and the Favre average.'' | * Difference between the Renynolds and the Favre average.'' | ||
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|'''Figure 1:''' Smooth bump case, Re=78490. Dimensionless instantaneous streamwise velocity at midspan using MIGALE with DG P3 (~300 million DoF/eqn). | |||
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Revision as of 10:10, 15 September 2022
Lib:Create_Ercoftac_Article_Form
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.
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| Figure 1: Smooth bump case, Re=78490. Dimensionless instantaneous streamwise velocity at midspan using MIGALE with DG P3 (~300 million DoF/eqn). |
Contributed by: Francesco Bassi, Alessandro Colombo, Francesco Carlo Massa — Università degli studi di Bergamo (UniBG)
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