Plenary Lecture
Using Computer Fluid Dynamics (CFD) for Teaching Hydrodynamics in Maritime Faculties
Professor Dumitru Dinu
Constanta Maritime University
Romania
E-mail: dinud@imc.ro
Abstract: ANSYS FLUENT is a CFD program based on finite volume calculation. It solves the Navier-Stokes equations for different cases. To calculate, we need to define geometry, corresponding to our problem and to create the mesh (the volumes in 3D or the squares in 2D). After realizing the geometry and the mesh we proceed to calculate. Post processing is also a very important phase.
Our students meet the program on courses, applications and research (master and Ph.D. studies).
We use this program to illustrate fluid properties and some important phenomena in hydrodynamics: Bernoulli’s equations for the relative movement of ideal non-compressible fluid, hydrostatic forces, flow with and without circulation around profiles, velocity distribution in circular conduits, forces on the hydrodynamic profiles, induced resistances in the case of finite span wings, boundary layer, etc.
Also the students can make a comparison between the results obtained in the laboratory and the results of simulation using Computer Fluid Dynamics. In the paper we give an example: flow measurement using the aperture stop. Mainly, these method is based on the fact that by throttling the flow section, there arises a difference between the pressure upstream and downstream from throttling which depends on the stream velocity and, implicitly, on flow. Vectorial representation of the velocity field is very important to understand the problem.
Finally, we emphasize the possibility to use CFD for research, mentioning some of the relevant works in the field. In one of them we studied the flow through circular conduit using distortional similarity by comparing “experimental” results with theoretical results, calculated by application of scale of physical magnitudes.
The program can be used as a “virtual stand” – is one of the interesting conclusions of the paper.
Brief Biography of the Speaker: Dumitru Dinu graduated from the University of Galati, Diplomat Engineer, Naval Architect and doctor in Technical Science – Fluid Mechanics of the same University. First, he worked in maritime research, deep diving systems and marine technologies in Romanian Institute for Marine Research. In 1990, Dumitru Dinu begins an academic career in Constanta Maritime University. Professor from 1993 and Doctoral Thesis Supervisor from 2001, he is a recognized specialist in Fluid Mechanics and Marine Technologies. He wrote 10 books and over 50 scientific papers in the fields: Marine Technologies, Fluid Mechanics and Hydraulic Machines, Marine Pollution, Maritime Education and Training. Former Rector of Constanta Maritime University, Prof. Dinu leads now the Marine Engineering research Center of the University. His researches focus now on Design and research in naval field using Computer Fluid Dynamics.