Direct Simulation and Modeling of Complex Turbulent Heat and Fluid Flow

Overview Owing to the recent development of computers, direct numerical simulation (DNS) has become eligible to predict turbulent flows in more complicated systems. DNS is now expected to serve as a tool for clarification and optimization of the complex phenomena such as the absorption/desorption of CO2 at sea-surface and the heat and flow dynamics in the compressors, turbines and recuperators in micro-gas turbines, which are all important from the viewpoint of energy and environmental issue. In the present study, we investigate the elementary phenomena appearing in the above-mentioned applications: turbulent mixing in rhombic ducts and T-junction; complex effects of body forces such as centrifugal/Colioris force; and mass transfer at air-water interface. As for the complex effects of body forces, for instance, we clarify the flow and heat transfer characteristics in channel flows subject to arbitrary-directional rotation and the fundamental process underlying those. Also, we open DNS databases and develop new LES and RANS models based on the DNS data, in order to give contribution to the establishment of an optimal designing method of complex heat and fluid flow devices. Sponsor: CREST (JST), FY1999-2003 (in part) Grant-in-Aid for Young Scientists (B) (MEXT) [PI: Y. Hasegawa]

Interfacial instantaneous scalar flux at high Schmidt number of 100 at (top); free surface and (bottom); solid surface DNS of turbulent flow around a T-junction

Recent Reports

• Hasegawa, Y, and Kasagi, N.,
  "Effects of Interfacial Velocity Boundary Condition on Turbulent Mass Transfer at High Schmidt Numbers,"
  Int. J. Heat Fluid Flow, Vol. 28, pp 1192-1203 (2007).
  (PDF 1.3 Mbytes, doi:10.1016/j.ijheatfluidflow.2007.04.016)

• Hasegawa, Y., and Kasagi, N.,
  "Systematic Analysis of High Schmidt Number Turbulent Mass Transfer across Clean, Contaminated and Solid Interfaces,"
  Proc. 5th Int Symp. on Turbulence and Shear Flow Phenomena, Munich, Aug. 27-29, 2007, pp. 1167-1172.
  (PDF 2.9MB bytes)

• Hasegawa, Y. and Kasagi, N.,
  "Turbulent mass transfer mechanism across a contaminated air-water interface,"
  Proc. 4th Int. Symp. Turbulence and Shear Flow Phenomena (TSFP-4), Williamsburg, Virginia, June 27-29, 2005, pp. 971-976.
  (PDF 864 kbytes)

• Mitsuishi, A., Hasegawa, Y. and Kasagi, N.,
  "Large eddy simulation of mass transfer across an air-water interface at high Schmidt numbers,"
  Proc. 6th ASME/JSME Thermal Engineering Joint Conference, Mar. 2003, Hawaii Island, Hawaii, CD-ROM Publication, TED-AJ03-231.
  (PDF 220 kbyte).

• Nagata, M. and Kasagi, N.,
  "Spatio-temporal evolution of coherent vortices in wall turbulence with streamwise curvature"
  J. Turbulence, Vol. 5, No. 017, (2004).
  (PDF 2.0 Mbytes, doi:10.1088/1468-5248/5/1/017)

• Wu, H. and Kasagi, N.,
  "Turbulent heat transfer in a channel flow with arbitrary directional system rotation,"
  Int. J. Heat Mass Transfer, Vol. 47, pp. 4579-4591 (2004).
  (PDF 840 kbytes, doi:10.1016/j.ijheatmasstransfer.2003.07.034).

• Wu, H. and Kasagi, N.,
  "Effects of arbitrary directional system rotation on turbulent channel flow"
  Phys. Fluids, Vol. 16, pp. 979-990 (2004).
  (PDF 1.0 Mbytes, doi:10.1063/1.1649337)

• Fukushima, N., Fukagata, K., Kasagi, N., Noguchi, H., and Tanimoto, K.,
  "Numerical and Experimental Study on Turbulent Thermal Mixing in a T-junction Flow,"
  Proc. 6th ASME/JSME Thermal Engineering Joint Conference, Mar. 2003, Hawaii Island, Hawaii, CD-ROM Publication, TED-AJ03-582.
  (PDF 5.1Mbyte).

• Fukushima, N. and Kasagi, N.,
  "Turbulent Momentum and Heat Transfer in Ducts of Rhombic Cross Section,"
  Heat Transfer 2002, Proceedings of the Twelfth International Heat Transfer Conference, Aug. 2002, Grenoble, France, vol. 2, pp. 207-212.
  (PDF 1.2 Mbyte, Book info.).

• Fukagata, K. and Kasagi, N.,
  "Highly Energy-Conservative Finite Difference Method for the Cylindrical Coordinate System,"
  J. Comput. Phys., Vol. 181, pp. 478-498 (2002).
  (PDF 188 kbytes, doi:10.1006/jcph.2002.7138)

Last update: 2007-12-4