An overview of previous researches related to the problem of flow around a
bluff-body, using experimental and numerical methods, is presented in the
paper. Experimental investigation was performed by a Laser Doppler
Anemometer (LDA), measuring velocity components of the water flow around a
smooth sphere and a sphere with dimples in square channels. Measurement
results in subcritical velocity flow field, velocity fluctuation components,
lift, drag and pressure coefficients, and 2D Reynolds stress at
quasi-stationary flow are conducted using 1D LDA probe. The obtained
experimental results are compared with numerical simulations, which are
performed using the ANSYS-CFX software. For the numerical simulations of
quasi-steady-state flow, k-? turbulent model was used, while for numerical
simulation of unsteady fluid flow and for the comparison of results related
to the eddy structures, vortex shedding and Reynolds stresses, Detached Eddy
Simulation were used. Since the obtained results of experimental and
numerical investigation of flow around smooth sphere and sphere with dimples
showed good agreement, the considered flow problem was expanded by
introducing the influence of a transverse magnetic field with a slight
modification of the electrical conductivity of the working fluid. The other
physical properties of the fluid remained the same, which also corresponds
to realistically possible physical conditions. Numerical simulations were
performed for three different values of Hartmann number and very small
values of Reynolds magnetic number (inductionless approximation).
Comparisons and analyzes of the results were made for the cases containing a
magnetic field and those with an absence of a magnetic field.
Experimental and CFD analysis of MHD flow around smooth sphere and sphere with dimples in subcritical and critical regimes
