scholarly journals 2D and 3D Potential Flow Simulation around NACA 0012 Airfoil with Ground Effect

2021 ◽  
Author(s):  
YavuzHakan Ozdemir ◽  
Baris Barlas
Keyword(s):  
Boundary Element ◽  
Potential Flow ◽  
Three Dimensional ◽  
Flow Simulation ◽  
Ground Effect ◽  
Physical Problems ◽  
Constant Strength ◽  
Simulation Results ◽  
Naca 0012 ◽  
2D And 3D

Abstract The purpose of this paper is to develop a Boundary Element Based Method (BEM) for determining the steady potential about two and three dimensional airfoil. The numerical investigation of NACA 0012 airfoil with using Boundary Element Method is utilized. Two different physical problems of the NACA 0012 airfoil are examined: potential flow around airfoil in an unbounded fluid and potential flow prediction with ground effect. Computation of potential flow around the airfoil is investigated by the mixed constant strength source and constant strength dipole based panel method. Boundary Element Code is written in FORTRAN. To check the accuracy of the 2D boundary element based code, the validation studies are carried out by comparing the present results obtained for the NACA 0012 airfoil from the XFoil and other published simulation results. 3D results are also evaluating with the available experimental and other numerical simulation results. The numerical outcomes are examined in terms of pressure distribution and lifting force on the foil.

Reduced-Order Modeling of Unsteady Flows About Complex Configurations Using the Boundary Element Method

2002 ◽  
Vol 124 (4) ◽  
pp. 988-993 ◽  
Author(s):  
V. Esfahanian ◽  
M. Behbahani-nejad
Keyword(s):  
Boundary Element Method ◽  
Boundary Element ◽  
Three Dimensional ◽  
Unsteady Flows ◽  
Reduced Order Modeling ◽  
Element Formulation ◽  
Reduced Order Models ◽  
Reduced Order ◽  
Naca 0012 ◽  
Element Method

An approach to developing a general technique for constructing reduced-order models of unsteady flows about three-dimensional complex geometries is presented. The boundary element method along with the potential flow is used to analyze unsteady flows over two-dimensional airfoils, three-dimensional wings, and wing-body configurations. Eigenanalysis of unsteady flows over a NACA 0012 airfoil, a three-dimensional wing with the NACA 0012 section and a wing-body configuration is performed in time domain based on the unsteady boundary element formulation. Reduced-order models are constructed with and without the static correction. The numerical results demonstrate the accuracy and efficiency of the present method in reduced-order modeling of unsteady flows over complex configurations.

Cooling Flow Simulation in the Enclosure of Mobile Generator

2004 ◽  
Author(s):  
J. Xie ◽  
R. S. Amano
Keyword(s):  
Heat Transfer ◽  
Pressure Drop ◽  
Flow Rate ◽  
Hot Spots ◽  
Three Dimensional ◽  
Flow Simulation ◽  
Cooling Flow ◽  
Simulation Results ◽  
Design Factors ◽  
Flow Study

A thermal and airflow simulation model is developed for three-dimensional cooling flow study of ventilation and heat transfer inside a mobile generator’s enclosure. The purpose of this design is to achieve better sound attenuation while keeping proper cooling of the engine and generator. This paper focuses its objectives on the adjustment and improvement of cooling performances of some design factors like vent size, vent positions, fan’s flow rate and airflow route based on the CFD approach. A zero-equation HVAC turbulence model was employed and the simulation results were compared with the standard k-ε model. Numerical results show that the proper distribution in the intake vents helps in achieving uniform cooling flow distributions by avoiding the occurrence of hot spots on the engine and generator surfaces. Pressure drop through muffler and radiator are both important factors. Effective flow path arrangement is also found to be one of the most fatal factors in the thermal and noise management.

scholarly journals On Unsteady Effects in WIG Craft Aerodynamics

2019 ◽  
Vol 2019 ◽  
pp. 1-14 ◽  
Author(s):  
Nikolai Kornev
Keyword(s):  
Time Domain ◽  
Potential Flow ◽  
Three Dimensional ◽  
Ground Effect ◽  
Two Dimensional ◽  
Unsteady Forces ◽  
Longitudinal Plane ◽  
Ground Effects ◽  
Unsteady Effects

The paper presents the analysis of unsteady forces and their influence on the aerodynamics and motion of a wing-in-ground (WIG) effect craft. Two-dimensional and three-dimensional aerodynamic models based on the potential flow are coupled with time domain simulations in the longitudinal plane. A special attention is paid to the explanation of the dynamic ground effect on both the sink and pitching motions. The influence of unsteady and quasi-steady forces on the dynamic ground effects and the craft motion is analyzed for different heights of flight.

Numerical simulation of flow patterns in the forebay and suction sump of Tianshan pumping station

2014 ◽  
Vol 9 (4) ◽  
pp. 519-525
Author(s):  
Jun Li ◽  
Yongmei Cao ◽  
Chuanchang Gao
Keyword(s):  
Numerical Simulation ◽  
Yellow River ◽  
Three Dimensional ◽  
Flow Simulation ◽  
Flow Patterns ◽  
The Yellow River ◽  
Technical Improvement ◽  
Pumping Station ◽  
Turbulence Flow ◽  
Simulation Results

Tianshan Pumping Station takes water from the Yellow River. A three-dimensional (3D) mathematical model of turbulence flow patterns in the forebay and suction sump was developed and a 3D turbulent flow simulation technique applied to numerical calculation of the flow pattern characteristics in both the original and rebuilt forebays of the pumping station. The numerical simulation results were analyzed and contrasted. The results showed that, with technical improvement, surface backflow was avoided, and bottom velocity in the forebay was increased while bottom velocity in the suction sump was unchanged. Because of this, there was no sediment deposition in the bottom of the forebay, and flow velocities in the forebay and suction sump were more evenly distributed.

The Effect of a Non-Equipartition of Energy on Multi-component Flows

2002 ◽  
Vol 759 ◽  
Author(s):  
J. E. Galvin ◽  
S. R. Dahl ◽  
C. M. Hrenya
Keyword(s):  
Hard Sphere ◽  
Binary Systems ◽  
Three Dimensional ◽  
Flow Simulation ◽  
Simple Shear Flow ◽  
Simulation Data ◽  
Theoretical Predictions ◽  
Simulation Results ◽  
Equipartition Of Energy ◽  
Accurate Stress

ABSTRACTRapid granular flows of two species with different material densities are examined via three-dimensional, hard-sphere simulations of simple shear flow. Simulation results are compared with existing theories for binary systems based on the kinetic theory analogy. The comparison between simulation data and theoretical predictions indicate that although non-equipartition is observed and well-predicted by the theory which accounts for its effects, the influence of non-equipartition on stress predictions is fairly small. The influence of non-Maxwellian effects, however, are critical for accurate stress predictions.

A Preliminary Analysis of a Turgo Type Turbine CFD Simulation Designed With an Integrated Dimensional Methodology

2012 ◽  
Author(s):  
Jorge Luis Clarembaux Correa ◽  
Jesús De Andrade ◽  
Miguel Asuaje
Keyword(s):  
Preliminary Analysis ◽  
Relative Velocity ◽  
Cfd Simulation ◽  
Three Dimensional ◽  
Numerical Approach ◽  
Hydrodynamic Performance ◽  
Volumetric Fraction ◽  
Hydrodynamic Parameters ◽  
Simulation Results ◽  
2D And 3D

A useful methodology in the design of a Turgo Type Turbine (TTT) has been accomplished through the theoretical calculation of the runner performance and efficiency, using 1D, 2D and 3D theory with certain simpliflying assumptions. The adaptation of several geometric and hydrodynamic parameters into the solution of the Rankine ovoids streamlines function, a three-dimensional potential flow, resulted in the design of a three dimensional TTT runner. A significant CFD simulation of this turbine was achieved, showing its hydrodynamic performance and the behaviour of the streamlines path through the buckets hit by the jet. The distribution of the water volumetric fraction was reported from the nozzle to the buckets In the same way, this numerical approach described the evolution of the velocity vectors from the water crossing the buckets. Furthermore, a comparison between the relative velocity angles from the three dimensional potential theory and the CFD simulation results was done, in order to find potential similarities from the water that actually passes into the buckets.

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