scholarly journals Numerical Prediction of the Cavitation in Pumps

2002 ◽  
Author(s):  
Philippe Dupont ◽  
Ernesto Casartelli
Keyword(s):  
Design Process ◽  
Computational Fluid Dynamic ◽  
Fluid Dynamic ◽  
Numerical Prediction ◽  
Main Flow ◽  
Point Of View ◽  
Specific Speed ◽  
Dynamic Software ◽  
Computational Fluid Dynamic Software

This paper presents a comparison between a coupled and a non-coupled approach for the prediction of the cavitation development in pumps. The coupling is defined here as the influence of the development of the cavitation on the main flow. Commercial CFD (computational fluid dynamic) software having a cavitation module and in-house developed code are used for this comparison. The intention of the authors is to evaluate these methods and their capabilities in predicting cavitating performance of pumps from an industrial point of view. In a first part, the two methods used are introduced and developed. In a second part, the results of these two approaches are compared for two impellers of the same specific speed having small geometrical differences leading to significant differences in the cavitation development. The ability and the benefits of the use of these different cavitation prediction approaches in the design process of a pump are finally discussed.

scholarly journals Cavitating Flow Calculations in Industry

2003 ◽  
Vol 9 (3) ◽  
pp. 163-170 ◽  
Author(s):  
Philippe Dupont ◽  
Tomoyoshi Okamura
Keyword(s):  
Centrifugal Pump ◽  
Design Process ◽  
Computational Fluid Dynamic ◽  
Fluid Dynamic ◽  
Point Of View ◽  
Prediction Methods ◽  
Software Packages ◽  
Commercial Code ◽  
Dynamic Software ◽  
Computational Fluid Dynamic Software

This paper presents the experiences of two pump manufacturers with numerical cavitation prediction methods available in commercial computational fluid dynamic software or in codes developed in-house. The intention of the authors is to evaluate these methods and their capabilities in predicting the cavitating performance of pumps from an industrial point of view.In the first part of the article, benchmarks were set for three different commercial software packages on the basis of a comparison of measurements obtained for a centrifugal pump. In the second part, the results of a commercial code are compared, for different impellers, to those obtained with a simplified cavitation prediction code.The abilities and the benefits of the various approaches to cavitation prediction in the design process of a pump are discussed.

scholarly journals Increasing the speed of computational fluid dynamics procedure for minimization the nitrogen oxide polution from the premixed atmospheric gas burner

2017 ◽  
Vol 21 (2) ◽  
pp. 1031-1041
Author(s):  
Vasko Fotev ◽  
Miroljub Adzic ◽  
Aleksandar Milivojevic
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Nitrogen Oxide ◽  
Computational Fluid Dynamic ◽  
Fluid Dynamic ◽  
Working Time ◽  
Innovative Method ◽  
Gas Burner ◽  
Dynamic Software ◽  
Computational Fluid Dynamic Software

This article presents innovative method for increasing the speed of procedure which includes complex computational fluid dynamic calculations for finding the distance between flame openings of atmospheric gas burner that lead to minimal NO pollution. The method is based on standard features included in commercial computational fluid dynamic software and shortens computer working time roughly seven times in this particular case.

Computational Investigations in Rectangular Convergent and Divergent Ribbed Channels

2018 ◽  
Vol 35 (2) ◽  
pp. 193-201
Author(s):  
Karthikeyan Sivakumar ◽  
N. Kulasekharan ◽  
E. Natarajan
Keyword(s):  
Computational Fluid Dynamic ◽  
Fluid Dynamic ◽  
Rectangular Channel ◽  
Turbulence Models ◽  
Reynolds Numbers ◽  
Ansys Fluent ◽  
Ribbed Channel ◽  
Rectangular Channels ◽  
Dynamic Software ◽  
Computational Fluid Dynamic Software

Abstract Computational investigations on the rib turbulated flow inside a convergent and divergent rectangular channel with square ribs of different rib heights and different Reynolds numbers (Re=20,000, 40,000 and 60,000). The ribs were arranged in a staggered fashion between the upper and lower surfaces of the test section. Computational investigations are carried out using computational fluid dynamic software ANSYS Fluent 14.0. Suitable solver settings like turbulence models were identified from the literature and the boundary conditions for the simulations on a solution of independent grid. Computations were carried out for both convergent and divergent channels with 0 (smooth duct), 1.5, 3, 6, 9 and 12 mm rib heights, to identify the ribbed channel with optimal performance, assessed using a thermo hydraulic performance parameter. The convergent and divergent rectangular channels show higher Nu values than the standard correlation values.

scholarly journals Numerical simulation of a fuel nozzle's spray

2021 ◽  
Author(s):  
Ashley Ann Marie Fergusson
Keyword(s):  
Computational Fluid Dynamic ◽  
Dynamic Models ◽  
Fluid Dynamic ◽  
Spray Parameters ◽  
Design Development ◽  
Development Stages ◽  
Parameter Spread ◽  
Dynamic Software ◽  
Computational Fluid Dynamic Software ◽  
A Minor

The aim of this thesis is to examine the boundary conditions that must be input into the computational fluid dynamic software, FLUENT in order to model spray. This can then be used to advance the current computational fluid dynamic models used to model an engine's combustor. This will save the industry time and money, in the design development stages. The parameters that were studied in this thesis included, changing the angle the spray is injected at and the Rosin-Rammler parameters: number of droplet diameters contained within the spray and the droplet diameters spread, determining the uniformity of the spread. The results found that it was possible to predict the Rosin-Rammler plot with a minor change of the Rosin-Rammler parameter, spread, q. It was also found that the initial assessments of the spray parameters provide reasonable trends in the axial and radial velocities.

scholarly journals Numerical simulation of a fuel nozzle's spray

2021 ◽  
Author(s):  
Ashley Ann Marie Fergusson
Keyword(s):  
Computational Fluid Dynamic ◽  
Dynamic Models ◽  
Fluid Dynamic ◽  
Spray Parameters ◽  
Design Development ◽  
Development Stages ◽  
Parameter Spread ◽  
Dynamic Software ◽  
Computational Fluid Dynamic Software ◽  
A Minor

The aim of this thesis is to examine the boundary conditions that must be input into the computational fluid dynamic software, FLUENT in order to model spray. This can then be used to advance the current computational fluid dynamic models used to model an engine's combustor. This will save the industry time and money, in the design development stages. The parameters that were studied in this thesis included, changing the angle the spray is injected at and the Rosin-Rammler parameters: number of droplet diameters contained within the spray and the droplet diameters spread, determining the uniformity of the spread. The results found that it was possible to predict the Rosin-Rammler plot with a minor change of the Rosin-Rammler parameter, spread, q. It was also found that the initial assessments of the spray parameters provide reasonable trends in the axial and radial velocities.

Numerical Simulation of Partial Oxidization Processing of Diesel for Fuel Cells

2003 ◽  
Author(s):  
Shaoping Shi ◽  
William A. Rogers ◽  
David A. Berry ◽  
Dushyant Shekhawat ◽  
Todd H. Gardner ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Chemical Reactions ◽  
Partial Oxidation ◽  
Computational Fluid Dynamic ◽  
Software Package ◽  
Fluid Dynamic ◽  
Reaction Model ◽  
Reduced Chemistry ◽  
Dynamic Software ◽  
Computational Fluid Dynamic Software

The application of a reduced, fuel-rich chemistry mechanism for n-Heptane partial oxidation was valid over the temperature range from 900 K to 1200 K and at the O/C ratio of 1.57. In this work, n-Heptane was utilized as a single fuel representative for diesel fuel to quantify CFD – Chemistry interation. The turbulence-reaction model is one of the standard combustion models developed in FLUENT, a commercial CFD (Computational Fluid Dynamic) software package. In this model, n-Heptane reduced chemistry mechanisms were coupled with the multi-dimensional CFD solver. The interaction between the chemical reactions and turbulence has been considered. In this paper, some preliminary results are presented and comparisons between the experiments and the simulations are made.

Numerical Simulation of Full Oxy-Fired Oscillating Combustion

2002 ◽  
Author(s):  
Ovidiu Marin ◽  
Benjamin Bugeat ◽  
Marc Till ◽  
Olivier Louedin
Keyword(s):  
Numerical Simulation ◽  
Fluid Dynamic ◽  
Combustion Process ◽  
Industrial Applications ◽  
Time Period ◽  
Complex Process ◽  
Combustion Technology ◽  
Dynamic Software ◽  
Computational Fluid Dynamic Software ◽  
Transient Numerical Simulation

Oscillating combustion represents a complex process, leading to significant improvements in high temperature industrial applications. Field demonstrations of the oscillating combustion technology have shown a significant reduction in NOx emissions, increased efficiency and improved operation. To date, no modeling work has been able to quantify these impacts of the technology. This effort presents the results of a numerical simulation study of oscillating combustion in a 450 kW pilot furnace. The combustion process involves a pipe-in-pipe natural gas-fired burner using exclusively oxygen as oxidant. The fuel is introduced into the combustion chamber periodically, given a certain amplitude and a time period, while the oxidant is introduced continuously. The transient numerical simulation uses the Air Liquide proprietary computational fluid dynamic software ATHENA™, analyzing the combustion process at incremental timesteps. The results reported here clearly explain the phenomena observed in the lab, as well as in field demonstrations. Detailed analysis of the mixing process between the fuel and oxidant, combustion of the reactants and heat transfer to the furnace walls is included. It is concluded that oscillating combustion represents a powerful solution to many industrial applications, and that modeling can play an important role in explaining the process, and in optimizing the system operation.

Numerical Simulation of Pressure Distribution around the Reticulated Shell Structure with Large Span

2013 ◽  
Vol 405-408 ◽  
pp. 710-712
Author(s):  
Zi Hou Yuan ◽  
Yi Chen Yuan ◽  
Wei Sun
Keyword(s):  
Pressure Distribution ◽  
Shell Structure ◽  
Fluid Dynamic ◽  
Flow Analysis ◽  
Wind Load ◽  
Wind Pressure ◽  
Large Span ◽  
Dynamic Software ◽  
Computational Fluid Dynamic Software ◽  
Reticulated Shell Structure

In order to investigate the pressure distribution around the reticulated shell structure with large span, a commercial Computational Fluid Dynamic software Fluent is employed to obtain the wind load and the coefficients of the time averaged pressure distribution around the reticulated shell structure in this paper. The numerical simulations of surface pressure are consistent with the experimental results. The characteristics of the wind pressure distribution are described through the flow analysis around the reticulated shell structure. All these discoveries can be used as a reference for the new version of the wind load criteria.

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