Chris Rehmann’s Research Group:  Mixing in Natural Flows

 

Group members

 

 

Prof. Chris Rehmann (rehmann@iastate.edu)

 

Our group studies mixing in natural flows, including turbulence and mixing in stratified flows, zebra mussel transport in rivers and estuaries, and environmental multiphase flows. We conduct laboratory experiments, field experiments, and numerical simulations.  Our group focuses on the physics and the science behind the problems we study, but our work applies to practical problems in oceanography, the control of aquatic invasive species, and the management of combined-sewer overflows

 

ISU students

 

Danielle Wain (wain@iastate.edu)

 

Danielle is comparing measurements of dissipation of turbulent kinetic energy with an acoustic Doppler velocimeter and a temperature microstructure instrument.  She measured temperature microstructure in a field experiment to estimate mixing in a bubble plume.

 

UIUC students

 

Meredith Carr (mcarr1@uiuc.edu)

 

Meredith has worked on the problem of transport of zebra mussel larvae in rivers.  She has planned, conducted, and analyzed results from two tracer studies in the Hudson River.  She constructed a numerical model of the exchange between a bay and the main channel of the Hudson River and evaluated possible effects of the bay on zebra mussel populations. For her Ph.D., she is developing an alternative way to estimate the dispersion coefficient in rivers.

 

 

Jin Hwan Hwang (jinhwang@uiuc.edu)

 

Jin is evaluating the effect of shear on double diffusive fluxes with experiments on double diffusive gravity currents.  His M.S. work involved heated salt wedges, or the ‘diffusive’ regime.  His Ph.D. work focuses on the salt finger case, which has greater relevance for oceanography.  Jin has also conducted direct numerical simulations of buoyancy-generated turbulence subjected to mean shear.

 

 

Ryan Jackson (prjackso@uiuc.edu)

 

Ryan is studying differential diffusion, or preferential transport of heat in a stably stratified flow.  His laboratory experiments have identified the conditions under which differential diffusion occurs, and he has evaluated the effect of differential diffusion on the mixing efficiency. He will continue his work by investigating the effect of shear on differential diffusion.

 

 

 

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