the present research simulates time-periodic unsteady transonic flow around pitching airfoils via the solution of unsteady euler and navier-stokes equations, using time spectral method (tsm) and compares it with the traditional methods such as bdf and explicit structured adaptive grid method. the tsm uses a fourier representation in time and hence solves for the periodic state directly accordin...

knowledge of fluid flow can play a basic role in optimizing mixing processes. in preparation of sodium perborate, sodium metaborate and hydrogen peroxide, as raw materials, mix and react in the presence of a turbine mixer. in this investigation, the effect of the presence of baffle in a mixing tank equipped with a two-impeller turbine agitator was studied. at first, steady state flow in the tan...

We simulate solidification in a narrow channel through the use of a phase-field model with an adaptive grid. In different regimes, we find that the solid can grow in fingerlike steady-state shapes, or become unstable, exhibiting unsteady growth. At low melt undercoolings, we find good agreement between our results, theoretical predictions, and experiment. For high undercoolings, we report evide...

Instantaneous streamlines are commonly used to visualize particle paths in steady flows. It is shown, however, that streaklines are often more appropriate for unsteady flows. The typical size of unsteady flow simulations makes interactive visualization difficult if not impossible. Two common approaches for visualizing unsteady flows are described. The advantages and disadvantages of each are di...

hydraulic simulation of water flow in irrigation canals may reveal management shortcomings and help managers find solutions to them. hydraulic simulation models can be appropriate tools for understanding hydraulic behavior of irrigation systems. in the present study, the steady state hec-ras model was tested and compared with the mike 11 unsteady state model. a secondary irrigation canal in the...

Experimental and Numerical Investigation of the Kinematic Theory of Unsteady Separation M. WELDON1, T. PEACOCK1, G. B. JACOBS2, M. HELU1, AND G. HALLER 1 Department of Mechanical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Ave., Rm 1-310, Cambridge, MA 02139, USA [email protected] Department of Aerospace Engineering & Engineering Mechanics, San Diego State University, 5500 C...

Motivated by an important application in the chemical and pharmaceutical industries, we consider non-stationary growth of a polydisperse ensemble crystals continuous crystallizer. The mathematical model includes effects crystal nucleation growth, fines dissolution, mass influx withdrawal product crystals. steady- unsteady-state solutions kinetic balance equations are analytically derived. stead...