For many practical cases, such as gas-wall interactions, molecular dynamics simulations are a perfect tool. Here we use such molecular dynamics simulation to study the micro heat transfer of gas in a nanochannel. However, to study larger microchannels molecular dynamics is computationally too expensive. Within the GASMEMS project, firstly an efficient parallel code will be developed and a metho...

Patients with functional gut disorders, irritable bowel disease, and related syndromes frequently attribute their symptoms to intestinal gas. While patients are usually convinced of their interpretation, the doctor has few arguments to confirm or refute it, and in this context intestinal gas has become a myth. Studies of intestinal gas dynamics have demonstrated subtle dysfunctions in intestina...

Epstein and Plesset's seminal work on the rate of gas bubble dissolution and growth in a simple liquid is generalized to render it applicable to a gas bubble embedded in a soft elastic solid. Both the underlying diffusion equation and the expression for the gas bubble pressure were modified to allow for the non-zero shear modulus of the medium. The extension of the diffusion equation results in...

Many early type barred spiral galaxies exhibit strong dustlanes at the leading edges of their bar (e.g. NGC 1300, NGC 1433), which from gas velocity field measurements and numerical hydrodynamical simulations are known to be the loci of shearing shocks with velocity gaps up to 200 km s −1 across. As an SBbc type galaxy, the Milky Way is expected to present similar dustlanes. Self-consistent hig...

The Department of Aerospace Engineering and Engineering Mechanics is pleased to offer the following research project for the summer of 2008. Interested students are urged to contact the faculty member(s) directing the project that most interests them. By contacting the faculty member, you can discover more about the project, learn what your responsibilities will be and, if possible, develop a t...

A computational study of the occurrence of rarefaction shock-wave (RSW) in a dense gas shock-tube is presented. The approach is based on the characterization of experimental variability and uncertainties in the thermodynamic properties of the fluid to investigate the realizability and reproducibility of a RSW in the FAST shock-tube at Delft University of Technology. The weakness of the RSW make...

In the context of offshore oil production, we are interested in accurate and fast computation of two-phase flows in pipelines. A one dimensional model of hyperbolic equations is solved numerically by an explicit Lagrange Euler projection method. This paper shows that adaptive multiresolution techniques can speed up the computation significantly. Even more so when local time stepping enhancement...

Theodor Meyer’s 1908 doctoral dissertation, with Ludwig Prandtl (1875–1953) as his advisor, introduced much of what has now become basic gas dynamics: not only the Prandtl–Meyer expansion but also the oblique-shock-wave theory as well. It is arguably the most influential dissertation in all of fluid dynamics. Yet no biography or even a photograph of Meyer has been available in the intervening c...

One of the more surprising results from X-ray astronomy is that the great volumes of space between galaxies in clusters of galaxies are not empty, as they appear in optical images. Instead, they are filled with a diffuse, hot plasma, with typical temperatures of T ∼ 107−108 K. At this temperature, the sound speed in the gas is comparable to the orbit velocities of the galaxies in the cluster, w...