Numerical Analysis of the Unsteady Subsonic Flow around a Plunging Airfoil

Unsteady flow past a plunging airfoil

This paper presents simulations of unsteady flow past a plunging airfoil using the highorder spectral difference (SD) method. Both third-order and fourth-order SD methods are used on unstructured quadrilateral grids. The vortex shedding pattern of an airfoil in an oscillating plunge motion becomes asymmetric at a sufficiently high frequency. The SD method is able to capture this effect and reve...

Optimal Control of Unsteady Stokes Flow around an Airfoil and the Sensor/actuator Placement Problem

The task of choosing good sensor and actuator locations to control a distributed system can result in search spaces which grow combinatorially. We propose to apply an initial effectiveness filter based on distributed LQR optimal control which can be computed at polynomial cost. This thought experiment, applied to the NACA 0015 airfoil in an unsteady Stokes flow regime, shows that a disturbance ...

Unsteady Numerical Simulations of Subsonic Flow Over a Projectile With Jet Interaction

Supercritical Flow over Unstalled Plunging Airfoil Computed by Euler Method

3D Numerical Study on Scouring Around Bridge Piers Under Unsteady Flow Condition

Local scouring around the bridges piers has always been considered as a problem, especially in rivers. If we do not take the necessary actions to avoid the occurrence of this phenomenon or to reduce its influence, then the bridge's piers will be destroyed. Placing the bridge piers' foundation far from the earth's surface will turn out in a plan which is not economic at all. Experimental studies...