October 2013: CFD Speaks
When Computational Fluid Dynamics (CFD) speaks it usually has interesting things to say. Our feature this month is a CFD study of car aerodynamics. Also you can browse a selection of general interest blog posts - one even relates to dinosaurs! Finally, listen to a podcast interview, "Rich Smith on CFD that won't break the bank", I did with Jeff Waters (Life Upfront blog) on the founding of Symscape and the development of Caedium, which targets small engineering consultancies.
Velocity contours and streamline arrows
What difference will adding a rear wing to a car make? You can expect an increase in downforce, equivalent to a reduction in lift, and an increase in drag. To quantify these effects I simulated the aerodynamics of a BMW Z3 using CFD without a wing and with a wing. Read more >>
Given the availability of Computer Aided Engineering (CAE) analysis tools, such as CFD, it is a surprise that analysis tools are not used more by architects during building concept design, especially relative to the local environment around a building. Read more >>
Researchers at the University of Southampton have tested a model of a Microraptor (a feathered, four-winged dinosaur) in a wind tunnel and found that it was optimized for slow gliding. Its multiple wings performed the same function as a modern-day, high-lift configuration used on airliners for takeoff and landing. Read more >>
The ease of Cartesian or wrapper-based meshing for CFD, including immersed boundary methods, is predicated on having a suitable surface mesh (e.g., STL) as an input. That surface mesh has certain constraints that, if not satisfied, will either cause a poor final mesh or can cause the Cartesian meshing process to fail. Read more >>