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Numerical and Mesh Resolution Requirements for Accurate Sonic Boom Prediction of Complete Aircraft
 

Summary: Numerical and Mesh Resolution Requirements for
Accurate Sonic Boom Prediction of Complete Aircraft
Configurations
S. Choi
, J. J. Alonso
, and E. Van der Weide
Department of Aeronautics & Astronautics
Stanford University, Stanford, CA 94305-3030
A careful study is conducted to assess the numerical mesh resolution requirements for
the accurate computation of sonic boom ground signatures produced by complete aircraft
configurations. The details of the ground signature can depend heavily on the accurate
prediction of the pressure distribution in the near-field of the aircraft. It is, therefore,
important to accurately describe the geometric details of complete configuration (includ-
ing the wing, fuselage, nacelles, diverters, etc) and to precisely capture the propagation of
shock and expansion waves at large distances from the aircraft. Unstructured, adaptive
mesh technologies are are ideally suited for this purpose as they use mesh points only in the
appropriate locations within the flow field. In this work, we consider a supersonic business
jet (SBJ) configuration that was tested at the NASA Langley Research Center. Near-field
data was measured at several locations underneath the flight track. The propagation of
these near-field signatures from different altitudes can be shown to result in near N-wave

  

Source: Alonso, Juan J. - Department of Aeronautics and Astronautics, Stanford University

 

Collections: Engineering