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36. e-AIRS: An e-Science Collaboration Portal for Aerospace Applications

Author

Kim, Yoonhee, Kim, Eun-kyung, Kim, Jeu Young, Cho, Jung-hyun, Kim, Chongam, Cho, Kum Won, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Dough, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Gerndt, Michael, editor, and Kranzlmüller, Dieter, editor

Published
2006
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39. Development of Cactus Driver for CFD Analyses in the Grid Computing Environment

Author

Ko, Soon-Heum, Won Cho, Kum, Duk Song, Young, Kim, Young Gyun, Na, Jeong-su, Kim, Chongam, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Dough, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Sloot, Peter M. A., editor, Hoekstra, Alfons G., editor, Priol, Thierry, editor, Reinefeld, Alexander, editor, and Bubak, Marian, editor

Published
2005
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50. Optimizing a boundary-layer-ingestion offset inlet by discrete adjoint approach

Author

Lee, Byung Joon, Liou, Meng-Sing, and Kim, Chongam

Subjects
Mathematical optimization -- Research, Boundary layer -- Properties, Aerospace and defense industries, Business
Abstract

A large amount of low-momentum boundary-layer flow ingesting into a flush-mounted inlet can cause significant total pressure loss and distortion to the extent beyond operability of a fan/compressor. To improve the quality of incoming flow into the engine, shape optimization of the surface geometry at the inlet entrance has been carried out using the discrete adjoint method; the inlet-floor shape is parameterized by the use of control points on B-spline surface patches. To resolve the complicated geometry flexibly and wail-bounded turbulent flow accurately, an overset mesh system is well-suited for integrating the flow analysis code, sensitivity analysis code, and grid modification tools. To enhance the convergence characteristics of the sensitivity analysis code, additional numerical dissipation for the discrete adjoint formulation is introduced. After using this optimization procedure, the new inlet yields a significant improvement in performance: a more than 50% reduction in flow distortion and a 3% increase in total pressure recovery. High performance at off-design conditions is also realized with only slight degradation, confirming the capability of the adjoint method for a practical design problem. Finally, the physical meaning and implication of the performance improvement are elaborated upon in relation to the flow characteristics resulting from the new design. DOI: 10.2514/1.J050222

Published
2010

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