Analysis of multipolar vortices in the interaction of a shock with a strong moving vortex. (15th November 2022)

• Record Type: Journal Article
• Authors: Kundu, Abhishek; Biswas, Gautam
• Is Part Of: Computers & fluids. Volume 248(2022)
• Publication Date: 2022-11-15
• Subjects: Multipolar vortices -- Shock-vortex interaction -- Vortex mach number -- Euler equations -- CUSP -- Compact scheme; Fluid dynamics -- Data processing -- Periodicals; 532.050285
• DOI: 10.1016/j.compfluid.2022.105686
• Languages: English
• ISSNs: 0045-7930

Abstract

Abstract: Numerical simulation results of a convecting shielded vortex interacting with a normal shock are presented. The shock and vortex Mach numbers covered are on the higher side, for which relatively little information is available. It is well known that for a weak shock the vortex survives the shock, and for stronger shocks it breaks down. We discover that there is a narrow zone of shock and vortex strengths for which the vortex neither preserves its shape, nor does it break down in the true sense, but generates a tripole or quadrupole — structures that have not so far been reported in shock-vortex interaction studies. A number of cases have been studied to determine the different shock-vortex interaction patterns depending on shock and vortex Mach numbers. A new type of interaction pattern has been determined and it has been named as Type-IV interaction. Highlights: Numerical simulation of a convecting shielded vortex interacting with a normal shock. The compact scheme in the CUSP framework for computing high speed compressible flow. Determination of shock-vortex interaction patterns depending on Mach numbers. Emergence of multipolar vortices in strong shock-vortex interaction. Understanding of the structure of the vortex deforms while passing through the shock.