Numerical Simulation and Thermometric Measurements on Mold Filling Dynamics

2002 ◽  
Author(s):  
Sayavur I. Bakhtiyarov ◽  
Ruel A. Overfelt ◽  
Matthew Edmondson
Keyword(s):  
Numerical Simulation ◽  
Liquid Metal ◽  
Flow Velocity ◽  
Software Package ◽  
Mold Filling ◽  
Cfd Simulations ◽  
Pressure Losses ◽  
Flow Simulations ◽  
3D Software ◽  
Lost Foam

In this paper we present the results of the CFD simulations of the mold filling dynamics in gravity and counter-gravity lost foam castings. FLOW-3D software package (Flow-Simulations, Inc.) has been used to predict flow velocity distributions and pressure losses when liquid metal flows in the step pattern. The results of simulations are compared to those obtained experimentally.

CFD Simulations of Flow Dynamics in Porous Media of Variable Permeability Arranged in Series

2001 ◽  
Author(s):  
Sayavur I. Bakhtiyarov ◽  
Dennis A. Siginer
Keyword(s):  
Porous Media ◽  
Software Package ◽  
Fluid Flows ◽  
Flow Dynamics ◽  
Cfd Simulations ◽  
Pressure Losses ◽  
Flow Simulations ◽  
Variable Permeability ◽  
In Series ◽  
3D Software

Abstract In this paper we present the results of the CFD simulations of the viscous fluid flow in two porous media of different permeability and same porosity arranged in series. FLOW-3D software package (Flow-Simulations, Inc.) has been used to predict flow velocity distributions and pressure losses when Newtonian fluid flows through the non-homogenous porous medium. The results of simulations are compared to those obtained experimentally earlier.

Numerical Simulation and Experimental Study of Heat and Mass Transfer Phenomena in Vacuum-Sealed Casting Process

2002 ◽  
Author(s):  
Sayavur I. Bakhtiyarov ◽  
Ruel A. Overfelt
Keyword(s):  
Numerical Simulations ◽  
Casting Process ◽  
Mold Filling ◽  
Metal Casting ◽  
Cfd Modeling ◽  
Casting Method ◽  
Flow Simulations ◽  
Fluid Fraction ◽  
3D Software ◽  
Velocity Pressure

The V-Process is one of the most exciting metal casting techniques developed recently, and it has many advantages compared to conventional casting methods. In this paper the results of the CFD modeling of mold filling process are presented. A vacuum-sealed step pattern has been used as a molding. Direct numerical simulations were conducted using a commercial CFD code (FLOW-3D software, Flow Simulations, Inc.) for the conventional gravity mold filling technique. Flow velocity, pressure and fluid fraction distributions are obtained for this casting method. The results of the numerical simulations are compared to those obtained experimentally.

Computer Simulations of Non-Newtonian Fluid Flow in Rectangular Cavity

2002 ◽  
Author(s):  
Ayten S. Bakhtiyarova
Keyword(s):  
Fluid Flow ◽  
Computer Simulations ◽  
Newtonian Fluid ◽  
Fluid Flows ◽  
Cavity Flow ◽  
Rectangular Cavity ◽  
Square Cavity ◽  
Cfd Simulations ◽  
Pressure Losses ◽  
Flow Simulations

In this paper we present the results of the CFD simulations of the non-Newtonian fluid flow in rectangular cavity. FLOW-3D commercial software (Flow-Simulations, Inc.) has been used to predict flow velocity distributions and pressure losses when non-Newtonian fluid flows through the square cavity.

Liquid Metal Stream Junction Defects in Aluminum Lost Foam Casting

2002 ◽  
Author(s):  
Sayavur I. Bakhtiyarov ◽  
Ruel A. Overfelt ◽  
Amit Suryawanshi
Keyword(s):  
Liquid Metal ◽  
Process Parameters ◽  
Mold Filling ◽  
Metal Stream ◽  
Lost Foam Casting ◽  
Lost Foam

The purpose of this work is to study fold defects in gravity and counter gravity lost foam casting processes, and to determine the process parameters which will improve the casting properties. The experiments are focused on the time and spatial dependent aspects of mold filling in frame shape styrofoam patterns.

Pneumatic pulsator design as an example of numerical simulations in engineering applications

2012 ◽  
Vol 2 (1) ◽  
Author(s):  
Krzysztof Wołosz ◽  
Jacek Wernik
Keyword(s):  
Fluid Dynamics ◽  
Numerical Simulation ◽  
Cast Iron ◽  
Numerical Simulations ◽  
Stress Analysis ◽  
Aluminium Alloy ◽  
Loose Material ◽  
Engineering Applications ◽  
Pressure Losses ◽  
Pneumatic Impact

AbstractThe paper presents the part of the investigation that has been carried out in order to develop the pneumatic pulsator which is to be employed as an unblocking device at lose material silo outlets. The part of numerical simulation is reported. The fluid dynamics issues have been outlined which are present during supersonic airflow thought the head of the pulsator. These issues describe the pneumatic impact phenomenon onto the loose material bed present in the silo to which walls the pulsator is assembled. The investigation presented in the paper are industrial applicable and the result is the working prototype of the industrial pneumatic pulsator. The numerical simulation has led to change the piston shape which is moving inside the head of the pulsator, and therefore, to reduce the pressure losses during the airflow. A stress analysis of the pulsator controller body has been carried out while the numerical simulation investigation part of the whole project. The analysis has made possible the change of the controller body material from cast iron to aluminium alloy.

Focusing Technique for Holographic Subsurface Radar Based on Image Entropy

2021 ◽  
Vol 36 (4) ◽  
pp. 373-378
Author(s):  
Haewon Jung ◽  
Dal-Jae Yun ◽  
Hoon Kang
Keyword(s):  
Numerical Simulation ◽  
Time Domain ◽  
Finite Difference Time Domain ◽  
Software Package ◽  
Reconstruction Algorithm ◽  
Simulation Software ◽  
Material Information ◽  
Difference Time ◽  
Actual Depth ◽  
Good Agreement

An image focusing method for holographic subsurface radar (HSR) is proposed herein. HSR is increasingly being utilized to survey objects buried at shallow depths and the acquired signals are converted into an image by a reconstruction algorithm. However, that algorithm requires actual depth and material information or depends on human decisions. In this paper, an entropy-based image focusing technique is proposed and validated by numerical simulation software package based on finite-difference time-domain method and experiment. The resulting images show good agreement with the actual positions and shapes of the targets.

The Effect of Turning Angle on the Loss Generation of LP Turbines

2017 ◽  
Author(s):  
Diego Torre ◽  
Guillermo Garcia-Valdecasas ◽  
David Cadrecha
Keyword(s):  
High Speed ◽  
Pressure Coefficient ◽  
Experimental Results ◽  
Cfd Simulations ◽  
Airfoil Surface ◽  
High Lift ◽  
Turning Angle ◽  
Pressure Losses ◽  
Coefficient Distribution ◽  
Inlet Angle

The effect of turning angle on the loss generation of Low Pressure (LP) Turbines has been investigated experimentally in a couple of turbine high-speed rigs. Both rigs consisted of a rotor-stator configuration. All the airfoils are high lift and high aspect ratio blades that are characteristic of state of the art LP Turbines. Both rigs are identical with exception of the stator. Therefore, two sets of stators have been manufactured and tested. The aerodynamic shape of both stators has been designed in order to achieve the same spanwise distribution of Cp (Pressure coefficient) over the airfoil surface, each one to its corresponding turning angles. Exit angle in both stators is the same. Therefore the change in turning is obtained by a different inlet angle. The aim of this experiment is to obtain the sensitivity of profile and endwall losses to turning angle by means of a back-to-back comparison between both sets of airfoils. Because the two sets of stators maintain the same pressure coefficient distribution, Reynolds number and Mach number, each one to its corresponding velocity triangles, one can state that the results are only affected by the turning angle. Experimental results are presented and compared in terms of area average, radial pitchwise average distributions and exit plane contours of total pressure losses. CFD simulations for the two sets of stators are also presented and compared with the experimental results.

scholarly journals Investigation of the Performances of a Diesel Engine Operating on Blended and Emulsified Biofuels from Rapeseed Oil

Energies ◽  
2021 ◽  
Vol 14 (20) ◽  
pp. 6661
Author(s):  
Vladimir Anatolyevich Markov ◽  
Bowen Sa ◽  
Sergey Nikolaevich Devyanin ◽  
Anatoly Anatolyevich Zherdev ◽  
Pablo Ramon Vallejo Maldonado ◽  
...  
Keyword(s):  
Diesel Engine ◽  
Rapeseed Oil ◽  
Characteristic Curve ◽  
Motor Fuel ◽  
Experimental Tests ◽  
Operating Conditions ◽  
Test Results ◽  
Cfd Simulations ◽  
Brake Thermal Efficiency ◽  
Flow Simulations

The article discusses the possibility of using blended biofuels from rapeseed oil (RO) as fuel for a diesel engine. RO blended diesel fuel (DF) and emulsified multicomponent biofuels have been investigated. Fuel physicochemical properties have been analyzed. Experimental tests of a diesel engine D-245 in the operating conditions of the external characteristic curve and the 13-mode test cycle have been conducted to investigate the effect of these fuels on engine performances. CFD simulations of the nozzle inner flow were performed for DF and ethanol-emulsified RO. The possibility of a significant improvement in brake thermal efficiency of the engine has been noted. The efficiency of using blended biofuels from RO as a motor fuel for diesel engines has been evaluated based on the experimental test results. It was shown that in comparison with the presence of RO in emulsified multicomponent biofuel, the presence of water has a more significant effect on NOx emission reduction. The content of RO and the content of water in the investigated emulsified fuels have a comparable influence on exhaust smoke reduction. Nozzle inner flow simulations show that the emulsification of RO changes its flow behaviors and cavitation regime.

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