Proposal for round jet test case

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Presentation transcript:

Proposal for round jet test case Charles Mockett CFD Software GmbH charles.mockett@cfd-berlin.com With support from NTS

Outline (notes) Intro (pronounced GA / Applications / Partners ) Proposed test case (Shur config / G3 (variation opt.) / BC / Focus on flow – far-field noise optional) Benchmark data (Bridges / Viswanathan) Envisaged investigations Non-zonal GA treatment Situation for embedded approaches not clear (UniMan?)

Introduction Hybrid RANS-LES of turbulent jet flows have very pronounced Grey Area Benchmark test case for jet noise applications Partners contributing: CFDB (coordinators) NLR NTS UniMAN Proposal for concrete test case definition presented Formulated in collaboration with NTS

Proposed test case M = 0.9, unheated, static jet, ReD = 1.1∙106, D = 0.06223 m Studied extensively by NTS Shur et al., Journal of Sound & Vibration 330 (2011) 4083-4097 Two-step approach RANS of jet & plume followed by ILES of plume Inside of nozzle not meshed: RANS solution imposed at nozzle outlet plane NTS grids and nozzle plane profiles will be made available to Go4Hybrid partners

Grids 4 different grid resolutions Coarse grid shown – hybrid H/O topology Slice z = 0 Slice x = D

Grids G3 proposed as mandatory Computation of grid study encouraged Nx Nr Nφ Cell count G1 308 81 64 1.6M G2 515 101 80 4.2M G3 160 8.4M G4 601 158 240 23M G3 proposed as mandatory Gives reasonable results at feasible numerical cost Computation of grid study encouraged Robustness of method to insufficient shear layer resolution

Benchmark data For mean flow / turbulence characteristics (mandatory) Measured in a number of studies Significant scatter “Consensus” data proposed by Bridges For far-field noise (optional) Measurements of Viswanathan appear most reliable

Mean streamwise velocity

Fluctuations of streamwise velocity

Far field sound

Remarks on method suitability Non-zonal approaches Assumes coupled simulation of nozzle and plume However only plume is meshed “Emulation” of real situation by imposing RANS solution at nozzle The test case seems suitable Embedded approaches Very thin boundary layer would make WMLES resolution inside nozzle unfeasibly expensive Negligible turbulence levels in core flow Questionable whether this case is suitable for embedded approaches => UniMAN? CFD Software GmbH Company Overview

Thank you for your attention Feedback? Questions?