# High Lift Prediction Workshop - Validation¶

Authors: A. Cimpoeru (CFMS), J. Appa (Zenotech) and D. Standingford (Zenotech)

November 2014

## Abstract¶

This document summarizes some initial results obtained within the second order benchmarking of a new CFD software. The zCFD code was used for the DLR F11 high lift configuration in order to compute the flow field using the k-ω SST turbulence model. The results consist of high Reynolds number computations for the simplified (Case 1) and complex (Case 2B) configurations at $$7^\circ$$ angle of attack. The results were validated against the numerical solutions obtained using CFD++ and ANSYS FLUENT and showed a good agreement with the experimental data.

## Introduction¶

The zCFD code is a GPU accelerated high performance computational fluid dynamic software. The zCFD solver is an unstructured cell centered finite volume code which solves explicitly the compressible Navier-Stokes equations. The solution is preconditioned and the convergence is accelerated using the Multigrid technique along with a dual time stepping method.

The results consist in high Reynolds number computations using k-ω SST turbulence model for the simplified (Case 1) and complex (Case 2B) configurations at $$7^\circ$$ angle of attack. The zCFD solutions were compared with wind tunnel data and other CFD codes such as Metacomp CFD++ and Ansys FLUENT. These codes were selected since they use the same cell-centered approach in combination with k-ω SST model.

## Results¶

Case 1, Coarse mesh (9.5M cells), $$Mach=0.175$$, $$Re=15e6$$, $$\alpha=7^\circ$$

Case 2b, Solar mesh (50M cells), $$Mach=0.175$$, $$Re=15e6$$, $$\alpha=7^\circ$$

DLR F11 High Lift Configuration; Locations of Pressure Sections. For the full definition of cutting planes refer to workshop website.