Engineering topics

Truong, K. V.

Publications and source records attributed to Truong, K. V..

3 records

NASA NTRS1993

Deriving Indicial Response From Navier-Stokes Equations

Report discusses research directed toward recasting indicial-response approach into form appropriate to study of vortex-induced oscillations and related aerodynamic and aeroelastic phenomena. Serves two purposes: to show how deficiencies of prior mathematical model overcome to include effects of memory necessary for modeling of oscillatory but otherwise equilibrium state; and using method developed to analyze particular case of flow past cylinder in periodic forced transverse motion.

Truong, K. V.↗

NASA NTRS1990

Indicial response approach derived from Navier-Stokes equations. Part 1: Time-invariant equilibrium state

The indicial response approach is recast in a form appropriate to the study of vortex induced oscillations phenomena. An appropriate form is demonstrated for the indicial response of the velocity field which may be derived directly from the Navier-Stokes equations. On the basis of the Navier-Stokes equations, it is demonstrated how a form of the velocity response to an arbitrary motion may be determined. To establish its connection with the previous work, the new approach is applied first to the simple situation wherein the indicial response has a time invariant equilibrium state. Results for the aerodynamic response to an arbitrary motion are shown to confirm to the form obtained previously.

Truong, K. V.↗

NASA NTRS1989

Application of the Laplace-Borel transformation to the representation of analytical solutions of Duffing's equation

Various features of the solutions of Duffing's equation are described using a representation of the solutions in the Laplace-Borel transform domain. An application of this technique is illustrated for the symmetry-breaking bifurcation of a hard spring.

Truong, K. V.↗