Navier-stokes predictions of the individual components of the pitch-damping coefficient sum

摘要

Computational predictions of the two individual coefficients that are part of the pitch-damping coefficient sum are presented. The coefficients are obtained using prescribed or forced motions that independently excite the two different angular rates which are associated with the two damping coefficients. A key feature of the approach is that steady flow fields are produced by the selected motions. This allows steady flow computational approaches to be applied, allowing results to be obtained in a computationally efficient manner. The predicted pitch-damping coefficient sum obtained by adding the individually determined coefficients in in excellent agreement with previous predictions of the pitch-damping coefficient sum and with experimental data. The individual coefficients are compared with slender body theory, and the results show similar trends though the slender body theory appears to under-predict the various coefficients.