60th CFD Seminar:
M4D, AN OPEN SOURCE RESEARCH CFD CODE FOR THE CALCULATION OF CLASSICAL AND TURBULENT/TRANSITIONAL FLOWS
Joan G. Moore, Retired
August 4, 2015, 11:00 am, NIA, Rm 137
M4D features unsteady convection adapted control volumes and the MARV/MARVS Reynolds stress models. Convection adapted control volumes are a paradigm shift in CFD. Used with tri-linear discretization of convected properties in space over a fixed grid (formally 3-d 2nd-order accurate), they provide a balance between accuracy and stability not found in fixed volume methods. The MARV/MARVS Reynolds stress models are advanced turbulence models which calculate transition naturally based on an understanding of homogeneous shear flow at high dimensionless strain rates. The presentation will concentrate on the convection adapted control volumes – the method, the combination of stability and accuracy, with the examples of an inviscid Kelvin-Helmholtz shear layer instability and near-DNS of flow in a square channel. The steady flow Reynolds stress model examples of transitional flow and heat transfer in a turbine cascade (Butler et al.) and of a backward facing step (Kasagi) also use the convection adapted control volumes.
It is fifty years since Joan and John Moore met in M.I.T.’s Gas Turbine Laboratory. John had come with a B.Sc. (Eng.) in Mechanical Engineering from Imperial College, London to obtain an S.M. and then an Sc.D from M.I.T. Joan with a B.S. in Applied Mathematics from M.I.T., had the job of writing computer codes and helping Graduate students with theirs. Thus began a life-long CFD and turbulence modeling collaboration. John is currently a Professor Emeritus of Mechanical Engineering at Virginia Tech. Their first ‘retirement’ project, their book “Functional Reynolds Stress Modeling” was published in 2006. And now Joan has written her 4th CFD code, M4D, but her first one unfettered by external sponsorship.