CFD Challenge: Solutions Using Open Source Flow Solver Caffa3d.MBRi With Immersed Boundary Condition

2012 ◽  
Author(s):  
Gabriel Usera ◽  
Mariana Mendina
Keyword(s):  
Boundary Condition ◽  
Pressure Drop ◽  
Open Source ◽  
Cost Effective ◽  
Immersed Boundary ◽  
Effective Solution ◽  
Flow Solver ◽  
Pressure Drops ◽  
Source Flow

Open source flow solver caffa3d.MBRi is applied in this work to solve the cases proposed in the SBC2012 CFD Challenge, offering an overall very cost effective solution. It is found that cycle-averaged pressure drops are well represented by correspoding stationary cases, while peak systole pressure drop values are widly overestimated by corresponding stationary cases.

Implementation and verification of gust modeling in an open-source flow solver

2019 ◽  
Vol 92 ◽  
pp. 777-789
Author(s):  
Mehdi Ghoreyshi ◽  
Adam Jirasek ◽  
Tyler Miller ◽  
Michael Nuzum ◽  
Roger Greenwood
Keyword(s):  
Open Source ◽  
Flow Solver ◽  
Source Flow

A General Purpose Parallel Block Structured Open Source Flow Solver

2012 ◽  
Author(s):  
Mariana Mendina ◽  
Martin Draper ◽  
Gabriel Narancio ◽  
Gabriel Usera ◽  
Ana Paula Kelm Soares
Keyword(s):  
Open Source ◽  
General Purpose ◽  
Flow Solver ◽  
Source Flow ◽  
Block Structured

Modeling Laminar Fluid Flows in Rectangular Vapor Grooves of Evaporators Used in Loop Heat Pipes

2010 ◽  
Author(s):  
Nirmalakanth Jesuthasan ◽  
B. Rabi Baliga
Keyword(s):  
Pressure Drop ◽  
Three Dimensional ◽  
Fluid Flows ◽  
Heat Pipes ◽  
Cost Effective ◽  
Operating Conditions ◽  
Pressure Drops ◽  
One Dimensional ◽  
Loop Heat Pipes ◽  
Dimensional Models

Loop heat pipes (LHPs) are devices in which capillary forces in a wick and liquid-vapor phase-change phenomena are used to achieve continuous and relatively high rates of transfer of thermal energy from a heat source to a heat sink. Quasi one-dimensional models of the fluid flow and heat transfer within LHPs, with empirical correlations as inputs, are commonly used as the basis of cost-effective computer simulations for the design and optimization of these devices for specific applications. The focus in this work is on laminar fluid flows in straight rectangular vapor grooves of flat evaporators used in LHPs. The pressure drops for such fluid flows are computed in available quasi one-dimensional models of LHPs using correlations for a friction factor that applies strictly only in the fully-developed region of flows in straight rectangular ducts with impermeable walls. The resulting errors can become serious if the pressure drop in the vapor grooves is a significant contributor to the overall pressure drop in the LHP. Thus, to enhance the capabilities of current quasi one-dimensional models of LHPs, more accurate correlations for predicting the aforementioned pressure drop are needed. In this work, a three-dimensional parabolic finite volume method is used to simulate laminar Newtonian fluid flows in straight rectangular vapor grooves of flat evaporators, for a representative range of LHP operating conditions. The mathematical model, computational methodology, results, and suitable correlations for the pressure drops are presented and discussed in this paper.

Modeling Flow Across a Race Car Air Filter

2006 ◽  
Author(s):  
Robert Binns ◽  
Kim A. Shollenberger
Keyword(s):  
Boundary Condition ◽  
Pressure Drop ◽  
Numerical Simulations ◽  
Three Dimensional ◽  
Filter Material ◽  
Fuel Mixture ◽  
Air Filter ◽  
Pressure Drops ◽  
Curve Fit ◽  
Visualization Techniques

Air entering a NASCAR stock car travels through an air filter enclosed in an “airbox” before being mixed with fuel. To maximize the mass of air/fuel mixture delivered to the cylinders, it is desired to minimize airflow restrictions. This paper presents a preliminary model to predict pressure drop and airflow across an air filter in a simplified geometry. The model includes experimental measurements and numerical simulations using a three-dimensional finite-volume package. The simplified geometry is a 1.52-m long flow channel with 12.7 cm by 7.97 cm cross-section. Measurements of pressure drop versus air velocity were made for separate and combined elements of the filter. A curve fit to the data is used to calculate coefficients for a porous-jump boundary condition used to model flow through porous media. Numerical simulations were run using this model for each filter element in the simplified geometry to verify that measured and calculated pressure drops agreed. Finally, flow visualization techniques were used to reveal streaklines in the flow. Good agreement was found between calculated streamlines and experimental observations. Thus, the porous jump boundary condition is a valid model for the filter material. Future work will include three-dimensional, transient numerical simulations of airflow within the airbox.

Experimental and Computational Analyses of Pressure Differentials in Flexible Ducts With Different Bent Angles

2007 ◽  
Author(s):  
Ray R. Taghavi ◽  
Wonjin Jin ◽  
Mario A. Medina
Keyword(s):  
Pressure Drop ◽  
Static Pressure ◽  
Complex Geometry ◽  
Analysis Data ◽  
Secondary Flows ◽  
Low Flow ◽  
Pressure Drops ◽  
Pressure Distributions ◽  
Geometrical Effects ◽  
Cfd Analyses

A set of experimental analyses was conducted to determine static pressure drops inside non-metallic flexible, spiral wire helix core ducts, with different bent angles. In addition, Computational Fluid Dynamics (CFD) solutions were performed and verified by comparing them to the experimental data. The CFD computations were carried out to produce more systematic pressure drop information through these complex-geometry ducts. The experimental setup was constructed according to ASHRAE Standard 120-1999. Five different bent angles (0, 30, 45, 60, and 90 degrees) were tested at relatively low flow rates (11 to 89 CFM). Also, two different bent radii and duct lengths were tested to study flexible duct geometrical effects on static pressure drops. FLUENT 6.2, using RANS based two equations - RNG k-ε model, was used for the CFD analyses. The experimental and CFD results showed that larger bent angles produced larger static pressure drops in the flexible ducts. CFD analysis data were found to be in relatively good agreement with the experimental results for all bent angle cases. However, the deviations became slightly larger at higher velocity regimes and at the longer test sections. Overall, static pressure drop for longer length cases were approximately 0.01in.H2O higher when compared to shorter cases because of the increase in resistance to the flow. Also, the CFD simulations captured more pronounced static pressure drops that were produced along the sharper turns. The stronger secondary flows, which resulted from higher and lower static pressure distributions in the outer and inner surfaces, respectively, contributed to these higher pressure drops.

An investigation of a cost-effective solution for multimedia medical information management

1995 ◽  
Vol 28 (6) ◽  
pp. 361-376 ◽  
Author(s):  
Ken Chee Keung Law ◽  
Horace Ho Shing Ip ◽  
Siu Lok Chan
Keyword(s):  
Information Management ◽  
Medical Information ◽  
Cost Effective ◽  
Effective Solution
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