eunsteady slip-flow of second grade non-newtonian electrically conducting fluid over an oscillating sheet has been considered and solved numerically. a second-order slip velocity model is used to predict the flow characteristic over the wall. with the assumption of infinite length in the x-direction, the velocity of the fluid can be assumed as a function of y and t, hence, with proper change va...

| We develop a numerically stable algorithm for the solution of a general Fluid-Flow model in steady-state. The uid dynamics is modulated by a Semi-Markov process, with Phase-type distributions for the sojourn times. We use an algo-rithmic solution to examine the impact of variance in the case of homogeneous On-OO sources, and diierences between the innnite and nite buuer case. The need for the...

We present a Petri net formalism that allows for mixed discrete and continuous stochastic models. The continuous part of the models consists of uid places that are lled and emptied at random (normally distributed) rate. Fluid places can be used for the modelling of continuous system components as well as for continuous approximation of heavily loaded discrete places in order to avoid state spac...