AFC4Hydro attended the 72nd American Physics Society (APS)- Division of Fluid Dynamics (DFD) meeting in Seattle Nov 24-26, 2019
@Washington State Convention center in Seattle. Site of the 72nd APS DFD meeting.
AFC4Hydro’s Morten Kjeldsen from FDB attended the 72nd APS-DFD meeting. A motivation for AFC4Hydro is to get inspiration and learn from flow control sessions at this meeting. One of the impacts of AFC4Hydro project is to disseminate knowledge about flow control techniques and technologies both generally and for hydropower specifically.
The APS DFD meeting is an annual meeting that takes place in different cities in the US. More than 3000 persons attend these meetings. Most attendants are usually affiliated universities, where the majority originate from the USA but with a fair share from Europe. The duration corresponds to three full days, with as much as 40 parallel sessions. This meeting is also known for its Gallery of Fluid Motion that consists of both poster and video- entries. A reception is also held for the participants and this year the Museum of Flight hosted the event.
The general sessions are dominated by oral presentations of 12 minutes including a 2 minutes discussion. This format forces a presentation with a more focus on motivation, background, status of research and preliminary results. The consequence being that this meeting gives an insight into the status of the various disciplines of Fluid Dynamics. In addition to the general sessions the APS DFD includes invited talks, award lectures and flash-presentations of the abovementioned Gallery of Fluid Motion. The full meeting schedule is available through the conference web site.
During the meeting Kjeldsen went to the following sessions related to flow control: Separated Flows: Control, Drag Reduction, Flow Control: Sensor Placement and Shape Optimization, Aerodynamics: Flow Control, Flow Control: Separation and Flow Control: Turbulence/ Flow Control: Model Reduction. The only contribution that shared similarities with the technologies developed by AFC4Hydro was that by An et al: Dynamic mode analysis and control of vortical flows in pump sumps. The presentation showed an axial jet shooting from the floor of the pump sump and towards the pump intake. This solution mitigates the effects of the swirl experienced by the pump.
In addition to application of Flow Control, the technologies themselves where scrutinized. Passive solutions, such as shark-skins, were discussed. Semi active control using synthetic jets, suction and blowing were discussed but mostly in an aerodynamic context. These technologies are analogous to those exploited in the AFC4Hydro project. Of special interest was the use of Fluidic Oscillators, which is a way to produce oscillations in the angle of injection for the jets or sweeping jets. This approach is something the AFC4Hydro will evaluate and in relation to use with Hydropower.
The days spent at the meeting proved to be as expected. Lots of impressions and inputs that will benefit the work on AFC4Hydro. As for recommendations of the APS-DFD meeting; if you ever want to be overwhelmed by the share amount of work going on in the field of fluid dynamics, this is the place to go!
Link for technical program: http://meetings.aps.org/Meeting/DFD19/Content/3770
Reception at the Museum Flight. A European contribution, the Concorde, on display.