a computational fluid dynamic (cfd) study of methanol (meoh) to dimethyl ether (dme) process in an adiabatic fixed-bed reactor is presented. one of the methods of industrial dme production is the catalytic dehydration of meoh. kinetic model was derived based on bercic rate. the parameters of this equation for a specific catalyst were tuned by solving a one-dimensional homogenous model using mat...

Initial steps in the application of a low-order panel method computational fluid dynamics (CFD) code to the calculation of aircraft dynamic stability and control (S&C) derivatives are documented. Several capabilities, unique to CFD but not unique to this particular demonstration, are identified and demonstrated in this paper. These unique capabilities complement conventional S&C techniques and ...

ASEE Annual Conference, Nashville, TN, 22-25 June 2003 Division for Experimentation and Laboratory-Oriented Studies (DELOS) Simulation technology is integrated into undergraduate engineering courses and laboratories through the development of teaching modules (TM) for complementary computational fluid dynamics (CFD), experimental fluid dynamics (EFD), and uncertainty analysis (UA). TM include t...

in some instances, it is inevitable that large amounts of potentially hazardous chemicals like chlorine gas are stored and used in facilities in densely populated areas. in such cases, all safety issues must be carefully considered. to reach this goal, it is important to have accurate information concerning chlorine gas behaviors and how it is dispersed in dense urban areas. furthermore, mainta...

The pumping capacity is the maximum flow rate through a pump at its design capacity. In process of water and other fluids, required to accurately size systems, determine friction head losses, construct system curve select motor. Failure choose right for system, improper installation operation results into higher consumption energy. insufficient affects plant’s operations such as maintenance cos...

Computational fluid dynamic (CFD) models are ubiquitous in aerodynamic design. Variable-fidelity optimization algorithms have proven to be computationally efficient and therefore suitable to reduce high CPU-cost related to the design process solely based on accurate CFD models. A convenient way of constructing the variable-fidelity models is by using the high-fidelity solver, but with a varying...

The definition of hazard area, centered inside the LNG stations, is essential for risk assessment in LNG industry. In this study, computational fluid dynamics (CFD) simulations have been conducted for the two main LNG hazards, LNG flammable vapor dispersion and LNG pool fire radiation, to determine the hazard exclusion area. The spatial and temporal distribution of hazard in complex spill scena...

The major portion of computing time in a computational fluid dynamic (CFD) flow solver is consumed by the solution of the linear equations, the use of an efficient matrix solver is critical to obtain high computing performance. Currently, Algebraic Multi-Grid (AMG) is recognized in CFD community as one of the best choices to achieve high efficiency for solving linear algebraic equations. As AMG...

Computational requirements of full scale computational fluid dynamics change as computation progresses on a parallel machine. The change in computational intensity causes workload imbalance of processors, which in turn requires a large amount of data movement at runtime. If parallel CFD is to be successful on a parallel or massively parallel machine, balancing of the runtime load is indispensab...

System identification is evaluated as an efficient and accurate technique for modeling unsteady aerodynamic forces for use in time-domain aeroelastic analysis. In the system identification methodology, the constant coefficients of a linear system model are fit to the computed response time histories from a 3-D, unsteady CFD solver. The resulting model of the unsteady CFD solution is independent...