New Releases by Michael Rex

A scarecrow chases his hat in the wind and finds other hats along the way that belong to various people.

Illustrations and one-word sentences portray a group of firefighters as they respond to a call and save a store from being destroyed.

A little boy, living out his fantasy of driving his own freight train, describes the different cars, what each carries, how they are connected, and more.

A girl wonders if her adventure with the Tooth Fairy was real or only a dream.

An elf helps Santa on Christmas Eve.

After several failed attempts, Bunny finally gets to paint something.

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.

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

"In this comically far-fetched book, a talented gorilla’s paintings of other zoo animals and their visitors earn her fame and fortune, which she’s not sure what do with.... In the end, this joyful painting gorilla reminds us that the best things in life are free." --Publishers Weekly

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.