BACKGROUND Existence of flows and convection is an essential and integral feature of many excitable media with wave propagation modes, such as blood coagulation or bioreactors. METHODS/RESULTS Here, propagation of two-dimensional waves is studied in parabolic channel flow of excitable medium of the FitzHugh-Nagumo type. Even if the stream velocity is hundreds of times higher that the wave vel...

The expression of 15 different potassium channel genes in rat atrial and ventricular muscle was quantitatively compared by use of an RNase protection assay. Of these genes, only five, Kv1.2, Kv1.4, Kv1.5, Kv2.1, and Kv4.2, were expressed at significant levels in cardiac muscle. In comparisons of atrial and ventricular RNA samples, transcripts from the Kv1.2 and Kv4.2 genes showed the largest di...

We studied the effect of wall boundary conditions on statistics in a wall-modeled large-eddy simulation (WMLES) turbulent channel flows. Three different forms condition based mean stress-balance equations were used to supply correct shear stress for wide range Reynolds numbers and grid resolutions applicable WMLES. In addition widely Neumann at wall, we considered case with no-slip which was im...

The law of the wall and the log law rule the near-wall mean velocity profile of three-dimensional turbulent flows. These well-known laws, which are validated by legions of experiments and simulations, may be universal. Here, using a soap-film channel, we report the first experimental test of these laws in quasi-two-dimensional turbulent channel flows under two disparate turbulent spectra. We fi...

A non-equilibrium wall model for large-eddy simulation with the immersed boundary (IB) method is proposed to reduce required number of grid points in simulating wall-bounded turbulence. The presented as an appropriate slip velocity on wall. constructed by integrating simplified turbulent layer (TBL) equation along wall-normal direction, which enhances integral momentum balance near a coarse gri...

In this work, we propose a single formula for the law of wall, which is dubbed as logarithmic-exponential (LOG-EXP) formula, predicting mean velocity profile in different regions near wall. And then feedforward neural network (FNN), whose inputs and training data are based on new trained wall-modelled large-eddy simulation (WMLES) turbulent channel flows. The direct numerical (DNS) flows used t...

The flow-induced translocation of polymer chains through a microfluidic channel is investigated using particle-based Dissipative Particle Dynamics and modified Langevin Dynamics approaches. Adaptive noslip wall boundary conditions have been implemented to model fluid flow in the microfluidic channel, paying attention to controlling fluid density fluctuations. By varying the magnitude of the ext...

A discontinuous Galerkin (DG) method is formulated, implemented, and tested for simulation of compressible turbulent flows. The method is applied to turbulent channel flow at low Reynolds number, where it is found to successfully predict low-order statistics with fewer degrees of freedom than traditional numerical methods. This reduction is achieved by utilizing local hp-refinement such that th...

multicast routing is one of the most important services in multi radio multi channel (mrmc) wireless mesh networks (wmn). multicast routing performance in wmns could be improved by choosing the best routes and the routes that have minimum interference to reach multicast receivers. in this paper we want to address the multicast routing problem for a given channel assignment in wmns. the channels...

many appealing multicast services such as on-demand tv, teleconference, online games and etc. can benefit from high available bandwidth in multi-radio multi-channel wireless mesh networks. when multiple simultaneous transmissions use a similar channel to transmit data packets, network performance degrades to a large extant. designing a good multicast tree to route data packets could enhance the...