New Releases by Michael Rex

A bright and simple concept book takes readers through a noisy, smelly, sudsy, cluttered, and thoroughly enjoyable kitchen. "The dishwasher is loud. The counter is cluttered. The blender is noisy. The sandwich is cut. The bags are plastic. The milk is spilled. The popcorn is popping!" Through breakfast, lunch, dinner, and dessert, the kitchen is filled with interesting sights, smells, sounds and tastes. On this delicious trip through the kitchen, detail-rich scenes will delight young children as they recognize familiar foods and objects and learn new words to describe them. There''s lots of fun to be had in the room where the syrup is sticky, the candy is hidden and the pie is cherry!

A group of young trick-or-treaters demonstrate that "feet are for stomping," "eyes are for peeking," "mouths are for moaning," and "tummies are for treating."

A simple presentation of a race car and how it is used and serviced during a race.

Flaps lift to reveal what different people, animals, or machines dig.

Lots of busy workers are building lots of different things. Who are they? Lift up the flaps to find out.

Previous investigations of oscillating (harmonic) flow past circular cylinders via the discrete vortex method have met with limited success due to a variety of reasons. These assumptions have proven to be too severe, and cannot allow the prediction of the kinematics and dynamics of the oscillating flow about bluff bodies in general and about a circular cylinder in particular. In the current analysis, the ambient velocity was given by U = Um sin wt, and the velocity distribution and the boundary layer were calculated about the cylinder at suitable time intervals. Several methods were implemented to predict separation, all of which required a minimum of arbitrary assumptions. Nascent vortices were placed at the separation points in such a manner that the Kutta condition was satisfied. Several functional forms of dissipation were investigated, but it was found not to be of overriding influence in the flow kinematics. Counter vortices were found to be a necessary aspect of the analysis, providing continuity from one half cycle to the next. Flow visualization experiments were conducted for a Keulegan-Carpenter number of 10 as a basis for comparison. The kinematics obtained from the numerical model produced a vortex shedding pattern which was typical of those observed experimentally for higher Keulegan-Carpenter numbers. Significant problems were encountered in the prediction of boundary layer separation. At this point, it was obvious that the interaction of a vortex with a boundary layer warranted analysis in a much simpler flow situation; the blade-vortex interaction (BVI) problem proved to be ideal.

A geometrically similar family of three supercavitating hydrofoils was tested in a variable pressure water tunnel. The half-span foils were of elliptical planform; the ratio of foil half-span to tunnel height was 1/4 for the small foil, 1/2 for the medium foil, and 3/4 for the largest foil. The tunnel was of square cross section. Lift, drag, moment, tunnel speed, ambient pressure, and cavity pressure were measured for attack angles from 8 to 21 degrees and a variety of ambient pressure settings; cavity length measurements were obtained from photographs. For the small and medium foils, it was sufficient to correct only for the effect on downwash of the images of the trailing vortices. The large foil data, however, required further correction; upon application of the same corrections which were applied to the data for the two smaller foils, the force and moment data for the large foil plotted slightly lower than did the data for the two smaller foils, while the cavity length data for the large foil indicated cavity lengths significantly larger than for either of the theoretical predictions or the cavity length data for the two smaller foils.