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Reading, United Kingdom

OpenFOAM is a C++ toolbox for the development of customized numerical solvers, and pre-/post-processing utilities for the solution of continuum mechanics problems, including computational fluid dynamics . The code is released as free and open source software under the GNU General Public License. It is maintained by The OpenFOAM Foundation, which is sponsored by the ESI Group, the owner of the trademark to the name OpenFOAM. Wikipedia.

Ashton N.,University of Manchester | West A.,CD adapco | Mendonca F.,OpenCFD
21st AIAA/CEAS Aeroacoustics Conference | Year: 2015

This paper presents work to assess the noise emissions from a high-lift three-element airfoil using hybrid RANS-LES methods on both structured and unstructured meshes. The primary purpose of this work is to assess the sensitivity of the grid type and resolution using the same finite-volume code, numerical scheme and turbulence model. It has been shown that whilst the structured mesh provides better correlation to experimental data, an unstructured grid provides a good prediction of both the aerodynamic and acoustic data. The difierences between both meshes is generally small and explained by a combi- nation of mesh resolution, RANS/LES activation and numerical error. In particular, the initial separated shear layer is identified as the most challenging area to capture correctly. Furthermore estimates are made on the computational efiort to compute an entire aircraft using hybrid RANS-LES methods, based upon the spatial and temporal resolution of this work. © 2015, American Institute of Aeronautics and Astronautics Inc, AIAA. All Rights Reserved. Source

Greenshields C.J.,OpenCFD | Reese J.M.,University of Strathclyde
Progress in Aerospace Sciences | Year: 2012

This paper investigates the use of Navier-Stokes-Fourier equations with non-equilibrium boundary conditions (BCs) for simulation of rarefied hypersonic flows. It revisits a largely forgotten derivation of velocity slip and temperature jump by Patterson, based on Grad's moment method. Mach 10 flow around a cylinder and Mach 12.7 flow over a flat plate are simulated using both computational fluid dynamics using the temperature jump BCs of Patterson and Smoluchowski and the direct simulation Monte-Carlo (DSMC) method. These flows exhibit such strongly non-equilibrium behaviour that, following Patterson's analysis, they are strictly beyond the range of applicability of the BCs. Nevertheless, the results using Patterson's temperature jump BC compare quite well with the DSMC and are consistently better than those using the standard Smoluchowski temperature jump BC. One explanation for this better performance is that an assumption made by Patterson, based on the flow being only slightly non-equilibrium, introduces an additional constraint to the resulting BC model in the case of highly non-equilibrium flows. © 2011 Elsevier Ltd. All rights reserved. Source

OpenCFD | Date: 2005-08-26

Data processing equipment and computers; computer software for computational fluid dynamics. Educational services, namely, conducting training courses and seminars in the field of software development and use of software for computational fluid dynamics, and distributing course materials in connection therewith. Scientific and technological services and research and design relating thereto; scientific and technological services, namely, research and design in the field of computational fluid dynamics software; design and development of computer hardware and software.

Greenshields C.J.,University of Strathclyde | Greenshields C.J.,OpenCFD | Weller H.G.,OpenCFD | Gasparini L.,Fondmetal Technologies S.r.l. | Reese J.M.,University of Strathclyde
International Journal for Numerical Methods in Fluids | Year: 2010

We describe the implementation of a computational fluid dynamics solver for the simulation of high-speed flows. It comprises a finite volume (FV) discretization using semi-discrete, non-staggered central schemes for colocated variables prescribed on a mesh of polyhedral cells that have an arbitrary number of faces. We describe the solver in detail, explaining the choice of variables whose face interpolation is limited, the choice of limiter, and a method for limiting the interpolation of a vector field that is independent of the coordinate system. The solution of momentum and energy transport in the Navier-Stokes equations uses an operator-splitting approach: first, we solve an explicit predictor equation for the convection of conserved variables, then an implicit corrector equation for the diffusion of primitive variables. Our solver is validated against four sets of data: (1) an analytical solution of the one-dimensional shock tube case; (2) a numerical solution of two dimensional, transient, supersonic flow over a forward-facing step; (3) interferogram density measurements of a supersonic jet from a circular nozzle; and (4) pressure and heat transfer measurements in hypersonic flow over a 25°-55° biconic. Our results indicate that the central-upwind scheme of Kurganov, Noelle and Petrova (SIAM J. Sci. Comput. 2001; 23:707-740) is competitive with the best methods previously published (e.g. piecewise parabolic method, Roe solver with van Leer limiting) and that it is inherently simple and well suited to a colocated, polyhedral FV framework. © 2009 John Wiley & Sons, Ltd. Source

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