Tandem Cylinder Flow Simulations Using Sixth Order Compact Scheme

Flow around tandem cylinder is solved using UPACS-LES code developed in JAXA. Delayed detached-eddy-simulation (DDES) is used, and order of numerical schemes and grid density are changed to investigate their sensitivities to the near-field flow and far-field noise. The results are compared with the experimental results. It became apparent that near-field flow structures including both steady and unsteady components are sensitive to the numerical scheme and grid density. As spatial resolution is increased, the results tend to converge toward the experimental results. On the other hand, far-field noise is insensitive to the spatial resolution. The dominant noise is generated by the impingement of the upstream cylinder wake on the downstream cylinder, and this large scale feature is already captured by the lowest spatial resolution case which we have calculated. The highest resolution case with long spanwise length (18D) shows good agreement in terms of both tonal and broadband component.

[1]  Takashi Yamane,et al.  The Development of the UPACS CFD Environment , 2003, ISHPC.

[2]  T. Imamura,et al.  Three-Dimensional Unsteady Flow Computations Around a Conventional Slat of High-Lift Devices , 2008 .

[3]  Meelan Choudhari,et al.  Measurements of Unsteady Wake Interference Between Tandem Cylinders , 2006, 36th AIAA Fluid Dynamics Conference and Exhibit.

[4]  Thomas F. Brooks,et al.  Tandem Cylinder Noise Predictions , 2007 .

[5]  Marcelo H. Kobayashi,et al.  Regular Article: On a Class of Padé Finite Volume Methods , 1999 .

[6]  T. Yamane,et al.  Development of a Common CFD Platform -UPACS- , 2001 .

[7]  P. Spalart,et al.  A New Version of Detached-eddy Simulation, Resistant to Ambiguous Grid Densities , 2006 .

[8]  D. Gaitonde,et al.  Pade-Type Higher-Order Boundary Filters for the Navier-Stokes Equations , 2000 .

[9]  D. L. Hawkings,et al.  Sound generation by turbulence and surfaces in arbitrary motion , 1969, Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences.

[10]  Luther N. Jenkins,et al.  Characterization of Unsteady Flow Structures Around Tandem Cylinders for Component Interaction Studies in Airframe Noise , 2005 .

[11]  HighWire Press.  Philosophical Transactions of the Royal Society of London , 1781, The London Medical Journal.

[12]  Eiji Shima,et al.  CFD Sensitivity of Drag Prediction on DLR-F6 Configuration by Structured Method and Unstructured Method , 2004 .

[13]  P. Spalart.  Comments on the feasibility of LES for wings, and on a hybrid RANS/LES approach , 1997 .

[14]  Kunihiko Kobayashi,et al.  Validation of Flows on High-Lift Configurations by Structured and Unstructured Mesh Method , 2005 .

[15]  Ana F. Tinetti,et al.  Acoustic Simulations of an Installed Tandem Cylinder Configuration , 2009 .

[16]  Luther N. Jenkins,et al.  Simulations of Bluff Body Flow Interaction for Noise Source Modeling , 2006 .

[17]  A. Lyrintzis.  Surface Integral Methods in Computational Aeroacoustics—From the (CFD) Near-Field to the (Acoustic) Far-Field , 2003 .