Submitted by Richard Smith on April 1, 2014 - 00:00
Aerodynamics plays a crucial role in the performance characteristics of outdoor cycling. However, no-one to my knowledge has used Computational Fluid Dynamics (CFD) to analyze the aerodynamic performance of a stationary bicycle - at least until now!
SketchUp Model of a Stationary Bicycle and Cyclist
Submitted by Richard Smith on March 26, 2014 - 13:09
Computation Fluid Dynamics (CFD) is synonymous with impressive 3D visualization. Learn more about the basic 3D visualization techniques in CFD and how they can help you reduce the mass of raw data from a simulation into insightful and beautiful graphics.
3D Visualization in CaediumCFD simulation of a cyclone
Submitted by Richard Smith on March 18, 2014 - 08:14
Turbulence modeling for the Reynolds Averaged Navier-Stokes (RANS) equations - the basis of most industrial Computational Fluid Dynamics (CFD) software - is a complex field. Trying to strike a balance between accuracy and computational efficiency has given rise to a relatively large number of different turbulence models. I am not aware of a definitive list to match turbulence models to applications - if you are, please share! With this in mind I'll share 6 suggestions before you consider switching the default turbulence model in your CFD software.
Submitted by Richard Smith on March 3, 2014 - 14:56
Why is there an ongoing effort to cram rich interactive 3D CAD/CAE applications into a web browser for desktop and laptop computers yet there is a proliferation of dedicated apps on tablets and smart phones?
Submitted by Richard Smith on February 28, 2014 - 08:00
Computational Fluid Dynamics (CFD) has the potential to overwhelm any computer, including the largest super computers, with generated flow field data (e.g., pressure, velocity) for transient (time dependent or time accurate) simulations. The traditional approach to transient simulations, and still widely used today, is to run a transient simulation and store entire flow field data sets at each time step for post processing at a later date. Given that a transient simulation can run for 10,000s of time steps, data management clearly becomes a significant issue, or more often a headache. However, there is an elegant alternative - co-processing.
CFD Co-Processing for a Transient Simulation in Caedium
Submitted by Richard Smith on February 13, 2014 - 09:16
Solid modeling is the dominant form of virtual object representation underpinning nearly all 3D Computer-Aided Design (CAD) systems. The strength of a solid model is that it defines a water tight (manifold) unambiguous object which implicitly delineates between the inside and the outside of an object simply by the alignment of the boundaries (B-rep or BREP) that define it. This makes solid modeling an ideal basis for virtual analysis techniques, e.g., stress analysis and Computational Fluid Dynamics (CFD). Also solid modeling provides a relatively straightforward path to manufacture through CNC machines and, more recently, 3D printing.
Cylinder Head Solid ModelBoundary Representation (B-rep or BREP)
Submitted by Richard Smith on January 30, 2014 - 11:46
Given how easy it is to define a sphere with a single value (radius) you'd think the fluid flow around a sphere would be simple too, right? However, as with many innocuous looking fluid problems, our intuition is wrong. The resulting flow characteristics, especially the drag variation with fluid velocity, are wild. Why does this matter? One word - sports.
CFD Simulation of Flow Around a SphereReynolds number 10,000, large unsteady asymmetric recirculation