sieve trays are widely used in the gas- liquid contactors such as distillation and absorption towers. in this article, a three-dimensional, two phase cfd model using euler-euler framework was developed to simulate a distillation tower with two sieve trays. hydrodynamic simulation of air and water system in different rates of gas phase was carried out and velocity distribution parameters, clear ...

In this paper a constitutive model formulated in the framework of multi-laminate models is applied to analyze pipe-jacking processes. The multi-laminate -based models consider various integration planes to formulate the stress-strain relationship. This basic feature of the framework has the advantage that yield criteria, flow and hardening rules are formulated on planes rather than in three-dim...

These days the use of models to predict process behaviour has become more and more common. The main reasons for this are that it is more practical and economical than using for example the trial and error method with expensive equipment. In the field of preparative chromatography the use of models to predict process behaviour has been proven to be very useful, especially for batch chromatograph...

Increasingly, organisations need to adapt to new conditions and competitive pressures. Various change management approaches such as business process reengineering have been developed to meet this perceived need. This paper investigates the potential of simulation modelling for modelling business processes. After a discussion on business processes related issues, an overview of business process ...

The paper introduces a new non-Gaussian simulation method that matches a target power spectrum and probability information. Numerical studies demonstrate applicability, convergence, and stationary properties. The method is shown to encompass a larger envelope of spectral/probabilistic descriptions than correlation distortion based methods. Specifically, the method is not constrained to relative...

We discuss methods for time-discretization and simulation of squareroot SDEs, both in isolation (CIR process) and as part of vector-SDEs modeling stochastic volatility (Heston model). Both exact and biased discretization methods are covered.

This chapter is concerned with reviewing the basic ideas and concepts underlying the use of regenerative structure in the development of efficient simulation algorithms. While it has long been known that discrete state space Markov chains exhibit regenerative structure, we argue that well-behaved discrete-event simulations typically also contain an embedded sequence of regeneration times. Howev...

This article concerns a simulation algorithm for unmarked and marked Hawkes processes. The algorithm suffers from edge effects but is much faster than the perfect simulation algorithm introduced in our previous work [12]. We derive various useful measures for the error committed when using the algorithm, and we discuss various empirical results for the algorithm compared with perfect simulations.

Techniques are presented for modeling and generating the univariate and multivariate probabilistic input processes that drive many simulation experiments. Among univariate input models, emphasis is given to the generalized beta distribution family, the Johnson translation system of distributions, and the Bézier distribution family. Among bivariate and higher-dimensional input models, emphasis i...