Numerical modeling of the flow fields inside the centrifugal air concentrator

1995 ◽  
Author(s):  
J Mo ◽  
Andrew Szady
Keyword(s):  
Numerical Modeling ◽  
Flow Fields

Numerical Modeling of Coupled VSTOL-Ship Airwake Flowfields

2004 ◽  
Author(s):  
S. Arunajatesan ◽  
J. Shipman ◽  
N. Sinha
Keyword(s):  
Numerical Modeling ◽  
Bluff Body ◽  
Flow Fields ◽  
Implicit Scheme ◽  
Navier Stokes ◽  
Governing Equations ◽  
Temporal Aspects ◽  
Time Marching ◽  
Edge Based

Validation of CRUNCH CFD® for problems of relevance to modeling coupled VSTOL-Ship Airwake flow fields is presented. The basic numerical framework consists of an edge based multi-element unstructured Navier-Stokes solver. The governing equations are solved using an upwind biased MUSCL scheme and an implicit scheme is used for time marching. Validation of the spatial and temporal aspects of the numerical framework are presented here, with a special emphasis on bluff body shedding problems as these are of particular relevance to the VSTOL-Ship airwake problem. Results from simulations of several unit problems are presented.

Means for Improving Pump Efficiency

2009 ◽  
Author(s):  
R. Karvinen ◽  
M. Koivikko ◽  
S. Virtanen
Keyword(s):  
Numerical Modeling ◽  
Flow Fields ◽  
Geometric Parameters ◽  
Pump Efficiency ◽  
Pump Performance ◽  
New Ideas ◽  
Proper Design ◽  
Specific Speed

The design of pumps has been mainly based on results obtained from experiments. Because there has been no detailed information concerning very complicated flow fields inside pumps, only by accident have some new ideas been found. At present, numerical modeling of the flow offers an opportunity to understand basic phenomena which make it possible to find new connections between hydraulic and geometric parameters. With the help of numerical modeling in a long-term project, new design instructions have been successfully developed. It seems that some existing ideas on how different factors affect pump performance should be re-evaluated. An important finding is that the effect of specific speed on efficiency is quite small. Also the efficiencies of existing pumps can be clearly improved with proper design.

scholarly journals Boundary-Adapted Numerical Modeling of Flow in a Hydrostatic Leadscrew

Actuators ◽  
2021 ◽  
Vol 10 (8) ◽  
pp. 190
Author(s):  
Zhe Su ◽  
Xianying Feng ◽  
Hui Li ◽  
Jiajia Lu ◽  
Zhaoguo Wang ◽  
...  
Keyword(s):  
Numerical Modeling ◽  
Parallel Plate ◽  
Flow Fields ◽  
New Method ◽  
Pressure Fields ◽  
Plate Elements ◽  
Actual Flow ◽  
Simulation Results ◽  
The Finite Difference Method ◽  
Experimental Values

A new method is presented to model and predict the flow fields of the hydrostatic leadscrews with greater accuracy. It is different from those available methods, in which various bearings are assumed to be equivalent to the screw-nut pair within a pitch by various means. In this new method, a helical coordinate system adapting to the boundaries of the flow fields is constructed, which makes the screw-nut meshing clearance calculated more accurate. Based on the finite difference method (FDM), the meshing clearance is discretized into a number of flow fields, which are created by numerous couples of parallel-plate elements moving relatively along the helicoid. The numerical model is solved in MATLAB, and the analyses about the pressure fields demonstrate its favorable performances in reflecting the actual flow fields. Furthermore, the simulation results are compared with the experimental values, confirming the feasibility of the proposed method.

Recurrence of fragmenting granules and their relation to meso- and supergranular flow fields

2003 ◽  
Vol 9 ◽  
pp. 371-371
Author(s):  
Th. Roudier ◽  
F. Lignières ◽  
M. Rieutord ◽  
P. N. Brandt ◽  
J.-M. Malherbe
Keyword(s):  
Flow Fields
Sign in / Sign up

Export Citation Format

Share Document