Force and wake observations for a circular cylinder undergoing forced 2-DOF motion in a free stream
Abstract
A series of forced motion experiments were performed for a circular cylinder undergoing combined in-line and cross-flow motion in a free stream. Variation of the in-line amplitude, cross-flow amplitude, reduced velocity, and phase between in-line and cross-flow motions were made for a Reynolds number of 7620, with a total of 9555 experiments. Forces were measured for all experiments and PIV visualization of the wake was made for select experiments. Specific phases between in-line and cross-flow motion are shown to have multiple possible wakes depending on the length of the experiment, with specific motion combinations being particularly sensitive to the conditions of the experiment. Although all forced motions were symmetric, asymmetry was observed in the wake for specific combinations of motion parameters, leading to asymmetric forcing and large mean lift. The measured forces and resulting wake are particularly sensitive to the phasing between in-line and cross-flow motion, indicating that if using forces derived through forced motion experiments for the prediction of 2-DOF vortex-induced vibrations, one should have sufficient resolution in the phase parameter in order to properly capture the variation in forces.
- Publication:
-
APS March Meeting Abstracts
- Pub Date:
- 2019
- Bibcode:
- 2019APS..MARC48004D