scholarly journals Non-isothermal vortex flow in the T-junction channel

2021 ◽  
Vol 2088 (1) ◽  
pp. 012034
Author(s):  
T A Baranova ◽  
Yu V Zhukova ◽  
A D Chorny ◽  
A N Skrypnik ◽  
R A Aksyanov ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Temperature Distribution ◽  
Boundary Conditions ◽  
Flow Structure ◽  
Vortex Flow ◽  
Flow Analysis ◽  
Computational Grids ◽  
Local Flow

Abstract In this work we present the numerical simulation of coolant mixing modes in the T-junction. We shows that the RANS approach is beneficial for a qualitative flow analysis to obtain relatively agreed averaged velocity and temperature. Moreover, traditionally, the RANS approach calculates only the averaged temperature distribution. It should also be emphasized that unlike the LES approach, the steady RANS approach cannot express a local flow structure in intense mixing zones. Nevertheless, apparently the used RANS approach should be used for assessing the quality of computational grids, boundary conditions in order to use the LES approach for further numerical simulation.

Unsteady Flow Structure and Global Variables in a Centrifugal Pump

2006 ◽  
Vol 128 (5) ◽  
pp. 937-946 ◽  
Author(s):  
José González ◽  
Carlos Santolaria
Keyword(s):  
Unsteady Flow ◽  
Centrifugal Pump ◽  
Flow Structure ◽  
Flow Model ◽  
Stokes Equations ◽  
Flow Analysis ◽  
Operating Conditions ◽  
Local Flow ◽  
Global Variables ◽  
Wide Range

A relationship between the global variables and the dynamic flow structure numerically obtained for a low specific speed centrifugal pump is presented in this paper. A previously developed unsteady flow model is used to correlate the dynamic field with the flow characteristics inside the impeller and volute of a single-stage commercial pump. Actually, the viscous incompressible Navier-Stokes equations are solved within a 3D unsteady flow model. A sliding mesh technique is applied to take into account the impeller-volute interaction. After the numerical model has been successfully compared with the experimental data for the unsteady pressure fluctuations pattern in the volute shroud, a new step is proposed in order to correlate the observed effects with the flow structure inside the pump. In particular, the torque as a function of the relative position of the impeller blades is related to the blades loading, and the secondary flow in the volute is related to the different pressure patterns numerically obtained. Local flow analysis and qualitative study of the helicity in different volute sections is performed. The main goal of the study presented is the successful correlation of local and global parameters for the flow in a centrifugal pump. The pressure forces seem to be the main driven mechanism to establish the flow features both in the impeller and volute, for a wide range of operating conditions.

scholarly journals Numerical Simulation of Vortex Flow Structure behind a Heaving Elastic Airfoil

2009 ◽  
Vol 29-1 (2) ◽  
pp. 1123-1123
Author(s):  
Tetsushi NAGATA ◽  
Masaki FUCHIWAKI ◽  
Kazuhiro TANAKA
Keyword(s):  
Numerical Simulation ◽  
Flow Structure ◽  
Vortex Flow

scholarly journals Numerical Simulation of Welding Process for Q235 Steel Plate

2019 ◽  
Vol 26 ◽  
pp. 03001
Author(s):  
Yukun Yang
Keyword(s):  
Numerical Simulation ◽  
Temperature Distribution ◽  
Boundary Conditions ◽  
Physical Properties ◽  
Thermal Cycle ◽  
Steel Plate ◽  
Welding Process ◽  
Q235 Steel ◽  
Simulation Results ◽  
Operation Results

In this paper, the weld of Q235 steel pipe with diameter of 60 mm and thickness of 4 mm is simulated and analyzed by MSC. Marc software. After modeling, applying material physical properties, setting weld bead and welding path, and applying boundary conditions, the operation results are analyzed and processed by submitting the work. According to the simulation results, different joints are selected to study the thermal cycle process and temperature distribution of joints under different joints.

scholarly journals Directional hyper-reduced model for evaluation of residual welding stresses in code_aster

2018 ◽  
Author(s):  
Tuan Dinh-Trong ◽  
David Ryckelynck ◽  
Mickaël Abbas ◽  
Sofiane Hendili
Keyword(s):  
Numerical Simulation ◽  
Heat Source ◽  
Residual Stresses ◽  
Boundary Conditions ◽  
Welding Process ◽  
Computation Time ◽  
Reduced Model ◽  
Residual Welding ◽  
Parametric Studies

The welding process produces strains and residual stresses that must be taken into account to evaluate the final quality of the assembly. For that, the simulation of the process by a thermomechanical computation is very widely used. Numerical simulation uses many parameters (materials, heat source, boundary conditions) whose effects must be studied. But as the compuation becoming very expensive, massive parametric studies quickly become unusable. To reduce the computation time, we propose an approach based on the spatial and temporal similarity of thermal results, by a method of hyper-reduction on a slice of the domain.

Numerical Simulation of Temperature Field in Laser Remanufacturing

2014 ◽  
Vol 633-634 ◽  
pp. 845-849
Author(s):  
Ling Dong ◽  
Xi Chen Yang ◽  
Yun Shan Wang ◽  
Jian Bo Lei
Keyword(s):  
Numerical Simulation ◽  
Finite Element Method ◽  
Finite Element ◽  
Temperature Field ◽  
Theoretical Model ◽  
Temperature Distribution ◽  
Simulation Method ◽  
Temperature Fields ◽  
Simulation Results

It plays an important role in guiding laser remanufacturing process and process control to research temperature field of laser remanufacturing. A numerical simulation method of temperature field based on MATLAB PDE Tool is proposed. Theoretical model of temperature field is presented. The temperature fields at different times are calculated and simulated with finite element method and MATLAB software with PDE Toolbox. The results show that this method can accurately calculate the temperature distribution of the laser remanufacturing process. The simulation results are helpful to optimize process parameters and to improve the quality of laser remanufacturing.

scholarly journals Temperature, moisture and stress fields in deck in the course of drying process in atypical chamber condensing sawn wood kiln

2004 ◽  
Vol 52 (1) ◽  
pp. 159-168
Author(s):  
Jan Tippner ◽  
Petr Koňas
Keyword(s):  
Numerical Simulation ◽  
Finite Element Method ◽  
Finite Element ◽  
Temperature Distribution ◽  
Boundary Conditions ◽  
Parametric Model ◽  
Moisture Distribution ◽  
Stress Fields ◽  
Drying Process ◽  
Model Pile

Common parametric model of sawn wood, geometry and finite element and physical parametric model pile sawn wood and its immediate airy environment was introduced. By the help of numerical simulation with Finite Element Method utilization the description of temperature distribution, dampness and stress in wood, in dependence on temperature and moisture distribution in airy environment of sawn wood kiln was included. Discussion about problem of design model, mesh refinement and definition boundary conditions was opened. Results of simulations make possible to propound the optimization of drying process. Direction of next investigation was outlined too.

NUMERICAL SIMULATION FOR FLOW ANALYSIS IN NON-ADIABATIC CAPILLARY TUBES

2017 ◽  
Author(s):  
Hugo Augusto ◽  
Felipe Silva ◽  
Caio Vinicios Juvencio da Silva ◽  
Maycon Ferreira Silva ◽  
Leonardo José Cavalcante Vasconcelos
Keyword(s):  
Numerical Simulation ◽  
Flow Analysis ◽  
Capillary Tubes

Numerical Simulation on Mold Electromagnetic Eccentric Stirring and Central Segregation of Round Bloom

2013 ◽  
Vol 652-654 ◽  
pp. 2450-2454
Author(s):  
Zhi Hong Zhang ◽  
Guo Guang Cheng
Keyword(s):  
Numerical Simulation ◽  
Mathematical Model ◽  
Electromagnetic Stirring ◽  
Center Line ◽  
Central Segregation

The paper describes multi-section round bloom casting using external MEMS, equipped with max section D600mm and min D280mm mold, the center line of D280mm mold not coincident with the axis of stirrer coils. it is exist eccentric electromagnetic stirring of mold which section less than max D600mm, a mathematical model of MEMS has been established, the index of central segregation of D280mm macrostructure had decreased less than 1.12 by optimized parameters of electromagnetic stirring and SEN immerse depth, in the end, the quality of round bloom had improved.

scholarly journals Numerical Simulation of Intrachamber Processes in the Power Plant

2021 ◽  
Vol 11 (11) ◽  
pp. 4990
Author(s):  
Boris Benderskiy ◽  
Peter Frankovský ◽  
Alena Chernova
Keyword(s):  
Numerical Simulation ◽  
Power Plant ◽  
Flow Structure ◽  
Power Plants ◽  
Control Volume ◽  
Conjugate Problem ◽  
Topological Features ◽  
Gas Dynamic ◽  
Calculation Results ◽  
Volume Method

This paper considers the issues of numerical modeling of nonstationary spatial gas dynamics in the pre-nozzle volume of the combustion chamber of a power plant with a cylindrical slot channel at the power plant of the mass supply surface. The numerical simulation for spatial objects is based on the solution conjugate problem of heat exchange by the control volume method in the open integrated platform for numerical simulation of continuum mechanics problems (openFoam). The calculation results for gas-dynamic and thermal processes in the power plant with a four-nozzle cover are presented. The analysis of gas-dynamic parameters and thermal flows near the nozzle cover, depending on the canal geometry, is given. The topological features of the flow structure and thermophysical parameters near the nozzle cap were studied. For the first time, the transformation of topological features of the flow structure in the pre-nozzle volume at changes in the mass channel’s geometry is revealed, described, and analyzed. The dependence of the Nusselt number in the central point of stagnation on the time of the power plants operation is revealed.

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