Investigation of the Flow and Noise Distribution on a Blower via Integration of Simulation and Experiments

As the consciousness of energy saving and carbon reduction and comfortable environment is paid in-creasing attention to, the common objective of various countries with decreasing energy is to develop and popularize high efficiency and low running noise blowers. This study uses CFD to calculate the flow field and performance of a blower and compare with the experimental measurement. The characteristic curve of blower shows that the simulated and experimental values are close to each other, the difference between the values is only 0.4%. This analysis result proofs the CFD package is a highly reliable tool for the future blower design improvement. In addition, this study discusses the noise distribution of blower flow field, the periodic pressure output value calculated by CFD is used in the sound source input of sound pressure field, so as to simulate and analyze the aerodynamic noise reading of the flow field around the blower. The result shows that the simulated value of flow field around the fan has as high as 80.5 dB(A) ~ 81.5 dB(A) noise level and is agree with measurement (82 dB(A)). The noise level is low but has a sharp noise. According to the numerical results, designer of the blower modify the tongue
geometry and remove the sharp noise.

Download “Investigation of the Flow and Noise Distribution on a Blower via Integration of Simulation and Experiments” Y. D. Kuan  J. M. Huang J. H. Wong C. Y. Chen «Department of Refrigeration, Air Conditioning and Energy Engineering National Chin-Yi University of Technology Taichung, Taiwan», S. M. Lee «Department of Aerospace Engineering Tamkang University New Taipei, Taiwan», C. N. Hsu «CHC Fans and Blowers Company Taichung, Taiwan»


A VALIDATION STUDY USING NREL PHASE VI EXPERIMENTS, PART I: LOW COMPUTATIONAL RESOURCE SCENARIO

CFD calculations of NREL Phase VI rotor under wide range of operation conditions were conducted using FlowVision software. Computations were performed for various wind speeds with axial inflow, constant RPM and constant blade pitch. The rotation of the blades was modeled via different approaches; steady-state with frozen rotor using rotating reference frame and transient with moving boundaries or sliding surfaces. In addition to this, an ‘Overlapping Boundary Layer (OBL)’ was implemented to resolve the boundary layer for a selected case. Turbulence models ‘k-ε-AKN and k-ω Shear Stress Transport (SST) were used and compared. Except the OBL case, FlowVision wall function approximation was employed for all calculations with y+ values between 30 and 100. Overall results were compared for all of the above-mentioned numerical approaches and showed good agreement with the experimental data. k-ω SST turbulence model is found to perform better to predict stall onset. The stall occurrence and general torque trend as a function of wind speed is fairly well captured. Comparisons of the static pressure distribution around blades with experimental data at different span-wise sections for different wind speeds are presented and good agreement is observed.

 

Download “A Validation Study Using NREL Phase VI Experiments, Part I: Low Computational Resource Scenario” A. Aksenov, U. Öztürk, C. YU P., Byvaltsev, S. Soğancı, O. Tutkun


Simulation of Explosions in FlowVision CFD Software

In the present paper the simulation of the explosion of condensed explosives in the air. The method used simulation by specifying the scope of compressed gas as the point source of the explosion. Describes the behavior of the blast wave on the middle and far distances from the source of the explosion, in which a pressure profile does not depend on the geometry of the source. The paper proposed to develop a method scope of the compressed gas provides the account properties of the products of the explosion for any explosive composition. Numerical investigation of the explosion of an explosive charge in the open countryside, in the presence of walls and rigidly fixed in the model of the urban environment. Shown good agreement with the experimental results and the peak pulse pressure both direct and reflected waves in each of the above cases.

Download “Simulation of explosions in FlowVision cfd software simulation of explosions in FlowVision cfd software” Y. Fisher, AE Schelyaev «TESIS», Moscow, Russian Federation


Verification Calculations as per CFD FlowVision Code for Sodium-Cooled Reactor Plants

The paper studies the experience in application of CFD FlowVision software for analytical validation of sodium-cooled fast reactor structure components and the results of performed verification, namely:

  • Development and implementation of new model of turbulent heat transfer in liquid sodium (LMS) in FlowVision software and model verification based on thermohydraulic characteristics studied by experiment at TEFLU test facility;
  • Simulation of flowing and mixing of coolant with different temperatures in the upper mixing chamber of fast neutron reactor through the example of BN-600 (comparison with the results obtained at the operating reactor).

Based on the analysis of the results obtained, the efficiency of CFD codes application for the considered problems is shown, and the proposals for CFD codes verification development as applied to the advanced sodium-cooled fast reactor designs are stated.

Download “Verification calculations as per CFD FlowVision code for sodium-cooled reactor plants” S.A. Rogozhkin, S.L. Osipov, S.F. Shepelev, A.A. Aksenov, M.L. Sazonova, V.V. Shmelev


Human Heart Blood Flow Simulations Based on CFD

In this paper, the modeling and simulation of the blood flow in the real patient heart is described. In order to cure the patients with cardio vascular disorder it is important to make appropriate choice of an artificial heart valve, it is important to exactly understand the behavior of the heart blood flow of the specific patient under treatment. The presented approach is based on the Magnetic Resonance Imaging/Tomography, which provides the necessary input to create the heart shape (“its geometry”) and its variation in time (tens or hundreds of frames) to define the internal time-dependent heart volumes for one heartbeat. Once this geometry is defined, the CFD software is applied to simulate the internal blood flow and further on visualize it to enable its further analysis. The applied CFD tool is FlowVision, due to its possibility to fully automatically perform the mesh generation of arbitrary shapes, as the heart geometry requires. In addition, FlowVision applies the dynamic mesh refinement by taking into account the motion of the heart-modeled surface, required by the CFD Euler model. The presented CFD approach to simulate the human internal blood flow is validated with data from MRI/MRT scans of the real heart and the respective simulation test cases are presented.

 

Download “Human Heart Blood Flow Simulations Based on CFD” Dean Vucinic, Tao Yang, Andrey A. Aksenov


Fluid-Structure-Interaction in a Beating Human Heart Model

Cardiovascular disease is the leading cause of death in developed countries and continues to drive significant research aimed at improving diagnosis and treatment. In cases where therapeutic medical device intervention is warranted, it is important to account for device-heart interaction over both the short and long term. In the short term, cardiac motion can significantly impact device stability and performance (as in the case of artificial heart valves), while over the long term, modified blood flow patterns may lead to structural remodeling that can have adverse effects on cardiovascular function. Computational tools used for device design, sizing, and placement must therefore be able to account for cardiac/vascular tissue mechanics, blood flow, and the interaction between them. Moreover, such tools must allow for patient-specific modeling and provide interactive visualization capabilities that can support clinical decision-making and reduce operator error.

Blood flow velocity at different time points in the FSI simulation

In this paper, we describe a methodology for bidirectional fluid-structure interaction between the general purpose CFD code FlowVision and the SIMULIA Living Heart Human Model (LHHM), a dynamic, anatomically realistic, four-chamber heart model that considers the interplay and coupling of electrical and mechanical fields acting in concert to regulate the heart filling, ejection, and overall pump functions. The LHHM natively includes a 1D fluid network model capable of representing dynamic pressure/volume changes in the intra- and extra-cardiac circulation. In the current work, we first replace this network model with a full 3D blood model (solved in FlowVision) that provides detailed spatial and temporal resolution of cardiac hemodynamics driven by motions of the beating heart and constrained with appropriate time-varying boundary conditions derived from the literature. After validating this approach, we activate bidirectional coupling between the blood flow CFD model and the LHHM electromechanical model using the SIMULIA co-simulation engine and discuss modeling details and results of interest.

Download “Fluid-Structure-Interaction in a Beating Human Heart Model” A. Aksenov, V.Pokhilko, A.Yushenko, B.Butz, P.Sridhar, K.D’Souza, W.Zietak


Using the CFD Technique to Analyze Tire Tread Hydroplaning Effects

Hydroplaning is a major cause of wet-road accidents. The main contact element between the ground and vehicle is the tire. Tire safety and performance are therefore critically important. Wet roads present several uncontrollable factors. This paper uses CFD (Computational Fluid Dynamics) to analyze wet road hydroplaning effects. Fluid dynamics cannot be easily measured using normal experiments. Therefore the braking distance and record rolling vary by encoder. We propose another method to analysis it. By this result, the large groove and tire depth can reduce hydroplaning effects. A second method is modifying the tire void pattern which can reduce the hydroplaning extent by 29%.

 

Download article “Using the CFD Technique to Analyze Tire Tread Hydroplaning Effects”  Min-Feng Sung*, Chin-Fu Chen, Chao-Jung Chen Kenda Rubber IND. CO., LTD, No.146, Sec. 1, Chung Shan Rd., Yuanlin, Chungha 51064, Taiwan.

Corresponding author’s email: bigeyes [AT] kenda.com.tw


Blood pump analysis for the U.S. Food & Drug Administration

The FDA (U.S. Food & Drug Administration) has partnered with academia and industry the Critical Path Initiative program to create a Guidance Document for industry-wide use proper validation and use of CFD models in the assessment of medical device safety.

CFD simulations are increasingly being used to determine flow patterns and fluid forces in order to evaluate blood-contacting medical devices. It is due to its potential to calculate the values of physical parameters that may affect the level of blood damage the device may cause, such as shear stress or dwell time. Although CFD can decrease the need for expensive prototyping and laboratory testing, there are no standardized and reliable methods available for using CFD techniques in this field.

The purpose of this project is to determine the limits of the applicability of CFD techniques by comparing some parameters (such as gauge pressure or shear stresses) of the computational simulations of a blood pump in several working conditions against suitable experimental models. The different conditions included a wide range of velocity profiles at the inlet or different rotor velocities.

FlowVision moving body capability, together with the real CAD geometry import, has allowed the numerical simulation of this complex case with a relatively simple mesh. Time-dependent results during a whole revolution of the rotor have been obtained, providing consistent and more realistic data for the different scenarios. As example, variables as the pressure gauge behave cyclic with a period of a 1⁄4 of the revolution time, which is consistent with the number of blades.

Images show some physical fields (such as velocity, shear stress, turbulent viscosity and pressure) that are required over different planes and surfaces for all possible cases.


Ship Hull Form Design and Optimization based on CFD

Nowadays, the Computational Fluid Dynamics (CFD) represents a standard design practice in solving the ship hydrodynamics problems, worldwide. In recent years CFD is actively in used by numerous maritime design organizations and related educational institutions. CFD is applied for propulsion research of the new-built or modernized ships, as it is well suited for the practice in the design and optimization of the ship hull form.

The presented results are also including the verification/validation analysis of the KCS hull form from the Gothenberg-2000 workshop has been developed by the authors of this paper, and through this comparative study, the best practices learned in this process, are shown. In this paper the FlowVision code is used as the CFD tool, integrating a new method of in-detail hull form design based on the wave-based optimization. The hull form design and its optimization are based on the systematic variation of the longitudinal distribution of the hull volume, while the vertical volume distribution is fixed or highly controlled. Such design process is underpinned with the respective data analysis of the obtained results, which are presented as the optimum distribution of the required hull volume. The final result is the optimized designed hull form, which shows interesting characteristics, as its resistance has decrease by 8.9% in respect to the well-known KCS hull form.

A.A. Aksenov Capvidia/TESIS, Moscow, Russia
A.V. Pechenyuk Digital Marine Technology, Odesa, Ukraine D.
Vučinić Vrije Universiteit Brussel, Brussels, Belgium

Towards Green Marine Technology and Transport – Guedes Soares, Dejhalla & Pavleti (Eds) © 2015 Taylor & Francis Group, London, ISBN 978-1-138-02887-6  Download article (PDF, 1.44MB)


The Propulsion Complex Design of the Cargo Ship of the Restricted Navigating Area on the Base of Modern CFD Methods

The constant grows of the motor fuel prices increases the requirements to the quality of ship propulsion study on the design stage. Some unusual approaches that applied during development of the “Volgo-Donmax” class ship project are described in this article.

The possibility of the nessary studies realization on base of the nowadays Computational Fluid Dynamics methods was offered by the Digital Marine Technology specialists. CFD methods, realizated in the complex of engeneering analysis, allow to find the complete picture of the ship hull flow at the early stage of it’s design. They permit solving the tasks of the ship hull form optimization and configuration of the appendages; studying of propulsor work conditions, steering gear and transverse thrusters.

Leonid I. Vishnevsky, Krylov Shipbuilding Research Institute

Gennady V. Egorov, Marine Engineering Bureau (MEB)

Boris N. Snatkov, Digital Marine Technology

Andrew V. Pechenyuk, Marine Technology

Download PDF, 0.65 MB


Simulation of the Mixing Bread Dough Process Using Computational Techniques

Mixing theory is important for its relevance in understanding some of the most fundamental problems involving bread dough flows, and for its practical impact in connection with bakery industry and other food industries. Mixing is a crucial operation in the bakery industry. The bread dough is a very complex material, considered viscoelastic whose behavior depends on moisture content and temperature. The aim of this article is to develop advanced technology for modeling bread dough mixing, in order to provide a predictive capability of optimum design parameters of dough mixers using computational techniques.

In this study, a CFD package Flow Vision was applied to build the model calculation and the calculation results.

For the study of the processes occurring in the mixer during its operation, computer simulations are made by means of the program system Flow Vision. For the purpose simulation of the mixing bread dough process using computational techniques of the simulations, the method
of the finite elements is used.

M. I. Luchian, S. Stefanov, I. LIitovchenko, I. Mihaylov, W. Hadjiiski

Bulletin of the Transilvania University of Braşov,

Series II: Forestry • Wood Industry • Agricultural Food Engineering • Vol. 6 (55) No. 2 – 2013, Page 1/6

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Simulating the Pouch Forming Process Using a Detailed Fluid-Structure Interaction

A deeper understanding of the interaction between machine, packaging material and liquid product during the forming process of pouches is enabled by the use of numerical simulation.

 

Tetra Pak pouch forming system forms the pouches in a continuous fashion starting from a tube of packaging material filled with the liquid to be packaged.
A bunch of jaws, moved with special laws, shape the tube of packaging material into pouches. The liquid into the tube is supplied through an inlet pipe, placed inside the tube. Additionally a pouch forming systems has a counter-pressure flange and a floater that moves along the inlet pipe and floats on top of the liquid column. The floater is used to control the flow rate at the inlet pipe. Thus a complex problem with flexible walls, free surface flows and kinematic motion of different bodies under hydrodynamic and gravity forces needs to be simulated.
Simulating the pouch forming, including a detailed fluid-structure interaction is the goal of this paper. The simulation is performed coupling Abaqus for the structural side and FlowVision for the fluid side through a Direct Coupling interface. The definition of the problem as well the results of the simulation are presented in the paper.

A. Mameli, A. Magnusson, Tetra Pak Packaging Solutions

A. Aksenov, K. Kuznetsov, T. Luniewski, I. Moskalev, Capvidia

2013 SIMULIA Customer Conference, Page 1/15

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Numerical Solving Problems of Spacecraft Design

Two different complex problems arising during spacecraft design are discussed in this paper. One problem is a definition of impulse for a safety separation of a parachute container lid. Another problem is defining a shock-wave interaction on the spacecraft at turning on emergency rescue system. Both problem are very hard and expensive for solving by experimental methods, and RSC Energia gets here all benefits of numerical simulation by using CFD code FlowVision.

 Aksenov A.A., Dyadkin А.А., Rybak S.P., Simakova T.V., TESIS Ltd, Moscow, Russia, JSV «RSC Energia» Korolev, Russia

29th Congress of the International Council of the Aeronautical Sciences, St. Petersburg, Russia, September 7-12, 2014, Page 1/5

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