Challenges in 3D CFD Modelling of Rotary Positive Displacement Machines

 

Abstract:

The use of Computational Fluid Dynamics (CFD) and Computational Continuum Mechanics (CCM) for analysis of rotary positive displacement machines is exponentially increasing which was mostly allowed by the development of methods for generating numerical grids of complex domains within the machines. However there are several challenges with the commercial CFD/CCM codes which are preventing generic use of these methods for modelling of rotating positive displacement machines. These are conservativeness of spatial discretisation caused by i) the inappropriate grid generation, ii) numerical instabilities and dissipation caused by misalignments of the flow direction and mesh, iii) application of inappropriate discretisation of equations and iv) the speed and accuracy of multiphase models used in CFD of positive displacement machines.

In this seminar the author will review methods used for modelling of rotary positive displacement machines and challenges which developers and users of these methods face. The talk will also offer some solutions and directions for resolving these issues.

 

Biography:

Professor Ahmed Kovacevic holds prestigious Howden/ Royal Academy of Engineering Research Chair in Compressor Technology at City, University of London. He develops excellence in academia and industry through research, teaching and collaboration with industry in the broad area of Fluid Machinery. Among other roles, he is the director of the renowned Centre for Compressor Technology, chair of the International Conference on Compressors and their Systems, Associate dean for corporate engagement at City, Non-executive specialist in Megger, Direstor of PDM Analysis Ltd and Co-Editor-in-chief of the Journal of Process Mechanical Engineering.

Professor Kovacevic authored 8 books and book chapters, more than 100 referenced journal and conference papers, holds rights to several patents and has received 9 awards for his work.