Submitted by Richard Smith on June 24, 2013 - 08:23
A Moving Reference Frame (MRF) is a relatively simple, robust, and efficient steady-state, Computational Fluid Dynamics (CFD) modeling technique to simulate rotating machinery. For example, the rotors on a quadcopter can be modeled with MRFs.
MRF CFD Simulation of a Quadcopter in FlightShows streamlines colored by velocity magnitude
Whether 3D printing can live up to the hype remains to be seen. However, making things has been around since time eternal. The fact that 3D printers have reached a price point allowing small businesses and hobbyists, collectively referred to as Makers, to leap on board is definitely exciting. However, what hasn't changed is that building a physical thing still costs time and money. What can we learn from the millennia of building things prior to the availability of 3D printers?
First Generation 3D Printer for HobbyistsCourtesy of Fab@Home
Submitted by Richard Smith on June 11, 2013 - 10:25
Helical strakes are often used on chimneys to reduce vortex induced vibration (VIV). However, these strakes also have a significant drawback - they induce massive increases in drag and side forces that have significant structural implications for the chimney. Read on for a Computational Fluid Dynamics (CFD) study that compares a smooth cylindrical chimney to the same chimney with helical strakes.
CFD Simulation of a Helical Strakes ChimneyVelocity magnitude contours
Submitted by Richard Smith on June 6, 2013 - 08:32
Do you want turning vanes with your duct work? Yes, if you are considering a square corner and you want to minimize your fan power requirement. Don't take my word for it, instead consider this Computational Fluid Dynamics (CFD) study that compares a vaneless square corner with both small turning vanes and large turning vanes.
Turning Vane CFD StudyVelocity magnitude contours on the symmetry plane
Submitted by Richard Smith on May 29, 2013 - 18:22
Zoology professor Warren Porter leads a team of researchers from the University of Wisconsin-Madison that uses Computational Fluid Dynamics (CFD) to simulate heat transfer and drag. No big deal you say, until you hear that the subject of his CFD simulations is an elephant!
The next release of the Caedium CFD software system will include an enhanced Accuracy tool with a new maximum mesh size parameter. The new size parameter will provide a method to set an explicit physical element size for an entity (e.g., face) rather than just an interval (resolution) number as in the current version of Caedium.
Enhanced Caedium Accuracy ToolInterval-Based (left) vs Size-Based (right) Mesh Parameters