Jiang, H. Department of Earth and Planetary Sciences, The Johns Hopkins University, hsjiang@gibbs.eps.jhu.edu
Meneveau, C. Department of Mechanical Engineering and Center for Environmental and Applied Fluid Mechanics, The Johns Hopkins University, meneveau@titan.me.jhu.edu
Osborn, T. R.. Department of Earth and Planetary Sciences and Center for Environmental and Applied Fluid Mechanics, The Johns Hopkins University, osborn@jhu.edu

 
NUMERICAL STUDY OF THE FEEDING CURRENT AROUND A COPEPOD
 
Three-dimensional, numerical simulations of the feeding current around a copepod are performed using a finite-volume code with curvilinear body-fitted coordinates. The accuracy of the code is verified by simulating two viscous flows for which analytical solutions are available. Simulations with a realistic body shape and Reynolds number are compared with observations from Yen and Strickler (1996), and good agreement is obtained. The appendages that generate the feeding current are represented by a distribution of motive forces acting on the water in front of the body. The numerical simulations allow us to systematically vary important parameters and to study their impact. For instance, we show that a distributed motive force arrangement dissipates significantly less energy (and increases the entrainment rate) as compared to a concentrated force. Variation of the copepod body shape shows little effect on the far-field of the feeding current, and may therefore not affect the detectability by other mechano-receptional organisms. The entrainment region is visualized by tracking particles in the feeding current and by plotting the resulting streamtube. The net reaction force on the copepod from the feeding current is comparable to, but is not sufficient to balance, the excess weight of the copepod.
 
Day: Monday, Feb. 1
Time: 03:45 - 04:00pm
Location: Sweeney Center
 
Code: SS01MO0345S