Numerical Characterization of Entropy Noise With a Density Based Solver

Abstract

In this work, dbnsTurbFoam, a new coupled density based solver, written in the framework of foam-extend, is considered. The solver is first assessed on two canonical compressible flow scenarios, namely the Sod's shock tube and the ONERA S8 transonic channel. Results are compared with analytical formulations and experiments, respectively. 2-D Unsteady Reynolds Averaged Navier-Stokes simulations and 3-D Large Eddy Simulations of the flow within the passages of a geometrically simplified High Pressure Turbine Nozzle Guide Vane are then performed. Results are compared against experimental data in order to justify the geometrical simplifications made. Finally, the case of a sinusoidal temperature forcing at the inlet is considered in order to study the phenomenon of indirect combustion noise. Notably, the impact of the forcing on the vortex shedding dynamics and on the losses is discussed. KEYWORDS dbnsTurbFoam, transonic blade passage, indirect combustion noise NOMENCLATURE H High of the ONERA transonic chanel (m) C ax Axial chord (m) St Strouhal number (-) M is Isentropic Mach number (-)

Large Eddy Simulations for Indirect Combustion Noise Assessment in a Nozzle Guide Vane Passage

“…The time integration is performed using an explicit 4-stage low-storage Runge-Kutta algorithm. The solver has been previously validated on two canonical compressible flow simulations by Chandramouli et al [12]. The LES simulations are initialized with the solution of the 2D Reynolds Averaged Navier-Stokes (RANS) equations using Favré averaging.…”

Validation of a numerical strategy to simulate the expansion around a plug nozzle

“…It has been chosen because it is considered particularly suitable for simulating supersonic turbulent flows and results the only compressible solver exploiting the Harten-Lax-van Leer-Contact (HLLC) approximate Riemann solver, crucial to correctly capture shock waves without smearing them [4]. In [5] the fidelity of dbnsTurbFoam is assessed: taking as references the Sod's shock tube (analytical solution, [6]) and the Onera S8 Transonic Channel (experimental data, [7]) scenarios, it is shown how dbnsTurbFoam is suitable to study high speed compressible flows. Turbulence is taken into account by means of the k-ω SST model developed by Menter [8].…”