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Effect of thermo-mechanical non-equilibrium on the onset of transition in supersonic boundary layers

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Abstract

Direct numerical simulations (DNS) for supersonic boundary layers (SBLs) with a free-stream Mach number of M = 2.2 are carried out. Various cases are investigated, involving the adiabatic and the isothermal (cooled and heated) walls. The laminar boundary layer is tripped using a blowing and suction strip with single-frequency and multiple spanwise wave-number excitation. Effects of thermo-mechanical non-equilibrium of thermal boundary layer on laminar-to-turbulent transition (LTT) are presented in detail. Cases with two perturbation intensities are investigated (0.5% and 2.4%). The receptivity analysis of transition onset location towards the thermo-mechanical non-equilibrium is performed using different physical quantities like streamwise evolution of skin-friction coefficient, Stanton number and Dynamic mode decomposition (DMD). The results reveal that thermo-mechanical non-equilibrium tends to advance the transition onset location and also decreases the transition length for the heated walls regardless of the initial perturbation intensity. However, for the cooled walls with 2.4% perturbation intensity, the existence of thermo-mechanical non-equilibrium has a stabilizing effect resulting in delayed transition onset. The flow stays laminar for cooled walls with 0.5% perturbation intensity. The results obtained from DMD analysis uncover two distinct ways of evolution for odd and even harmonics of the perturbation frequency. DMD results also show that the fundamental evolution of the modes is not affected by the physical flow parameters like wall temperature or existence of thermo-mechanical non-equilibrium. It is observed that the imposed frequency mode or the principal mode is dominant in the transition region and eventually breakdown to smaller structures in the turbulent regime.

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Acknowledgments

This work was granted access to HPC resources of IDRIS under the allocation 2017-100752 made by GENCI (Grand Equipement National de Calcul Intensif- A0022A10103). The authors acknowledge the access to HPC resources of French regional computing center of Normandy named CRIANN (Centre Régional Informatique et d’Applications Numériques de Normandie) under the allocations 1998022 and 2017002. This project is co-financed by the European Union with the European Regional Development Fund (FEDER) and the Normandy regional council through project ‘NEPTUNE’.

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Sharma, S., Shadloo, M.S. & Hadjadj, A. Effect of thermo-mechanical non-equilibrium on the onset of transition in supersonic boundary layers. Heat Mass Transfer 55, 1849–1861 (2019). https://doi.org/10.1007/s00231-018-2429-9

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  • DOI: https://doi.org/10.1007/s00231-018-2429-9

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