LES and URANS Unsteady Boundary Layer Strategies for Pulsating and Oscillating Turbulent Channel Flows Applications

The use of wall functions has been investigated for LES and URANS numerical simulation in pulsating and oscillating channel flow applications. The results show that the wall function approach is accurate in the so-called quasi-steady regime but there are discrepancies with the experimental results in the intermediate frequency range. A special...

The DLR TAU-Code: Recent Applications in Research and Industry

This paper gives an overview of the TAU-Code, DLR's system for complex flow simulations on unstructured hybrid grids. Starting from a short description of the system and its components, e.g. mesh adaptation or grid deformation, its basic capabilities are discussed. Thereafter recent and on-going developments are presented, such as the adjoint...

Time dependent adaptation for compressible flows

The paper deals with the algorithm for unsteady anisotropic adaptation. The adaptation is using the remeshing approach to create a new refined grid. The grid is generated in computational space defined by metric field based on the tensor error indicator. The verification of the method is done first for 2D supersonic flow in a channel with...

On the Validation of The Particle Finite Element Method (PFEM) for complex engineering fluid flow problems

Several comparisons between experiments and computational models are presented in the following pages. The objective is to verify the ability of Particle Finite Elements Methods (PFEM) to reproduce hydraulic phenomena involving large deformation of the fluid domain.

Direct numerical simulation of the turbulent flow around an airfoil using spectral/HP method

Since the accuracy of the widely used Reynolds Averaged Navier Stokes (RANS) approach is limited simulating turbulent flow separation on airfoils, we applied a spectral/hp element method to predict the turbulent flow separation at an airfoil for an angle of attack of 12°. The spectral/hp approach allows to solve the incompressible Navier-Stokes...

Multiscale multi-dimensional explicit a-posteriori error estimation for fluid dynamics

A-posteriori error estimation of convection-dominated and hyperbolic flow problems remains one of the largest challenges in computational mechanics. The available techniques are either non-robust (i.e. the predicted error differs by orders of magnitude from the exact error) or computationally involved (i.e. requiring the solution of additional...

Computational Modeling of Gas Liquid Interfaces Using Different Multiphase Models

A time dependent Computational Fluid Dynamics analysis of gas jets impinging onto liquid pools has been conducted. The aim of the study is to obtain a better understanding of highly complex, and industrially relevant flows in jetting system. Three different multiphase models, i.e., The Eulerian model, the volume of fluid model and the mixture...

A computational method for high-frequency oleodynamics, application to hydraulic-shock-absorber designs

Large scale modeling in computational fluid dynamics

Symposium of the Fluid Dynamics Panel in Monterey. Agard Conference Proceedings Aerodynamic and Related Hydrdodynamic Studies Using Water Facilities

Contents of Symposium of the Fluid Dynamics Panel in Monterey. Agard Conference Proceedings Aerodynamic and Related Hydrdodynamic Studies Using Water Facilities