scholarly journals A Comparison of Physical and Numerical Modeling of Homogenous Isotropic Propeller Blades

2020 ◽  
Vol 8 (1) ◽  
pp. 21 ◽  
Author(s):  
Luca Savio ◽  
Lucia Sileo ◽  
Sigmund Kyrre Ås
Keyword(s):  
Numerical Modeling ◽  
Open Water ◽  
Computational Approach ◽  
Experimental Setup ◽  
Fluid Structure ◽  
Towing Tank ◽  
Design Procedures ◽  
Structure Interaction ◽  
Marine Propellers ◽  
Propeller Blades

Results of the fluid-structure co-simulations that were carried out as part of the FleksProp project are presented. The FleksProp project aims to establish better design procedures that take into account the hydroelastic behavior of marine propellers and thrusters. Part of the project is devoted to establishing good validation cases for fluid-structure interaction (FSI) simulations. More specifically, this paper describes the comparison of the numerical computations carried out on three propeller designs that were produced in both a metal and resin variant. The metal version could practically be considered rigid in model scale, while the resin variant would show measurable deformations. Both variants were then tested in open water condition at SINTEF Ocean’s towing tank. The tests were carried out at different propeller rotational speeds, advance coefficients, and pitch settings. The computations were carried out using the commercial software STAR-CCM+ and Abaqus. This paper describes briefly the experimental setup and focuses on the numerical setup and the discussion of the results. The simulations agreed well with the experiments; hence, the computational approach has been validated.

scholarly journals Numerical modeling in arterial hemodynamics incorporating fluid-structure interaction and microcirculation

2021 ◽  
Vol 18 (1) ◽  
Author(s):  
Fan He ◽  
Lu Hua ◽  
Tingting Guo
Keyword(s):  
Numerical Modeling ◽  
Shear Stress ◽  
Wall Shear Stress ◽  
Fluid Structure Interaction ◽  
Rigid Wall ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Arterial Hemodynamics ◽  
Wall Compliance ◽  
Wall Shear

Abstract Background The effects of arterial wall compliance on blood flow have been revealed using fluid-structure interaction in last decades. However, microcirculation is not considered in previous researches. In fact, microcirculation plays a key role in regulating blood flow. Therefore, it is very necessary to involve microcirculation in arterial hemodynamics. Objective The main purpose of the present study is to investigate how wall compliance affects the flow characteristics and to establish the comparisons of these flow variables with rigid wall when microcirculation is considered. Methods We present numerical modeling in arterial hemodynamics incorporating fluid-structure interaction and microcirculation. A novel outlet boundary condition is employed to prescribe microcirculation in an idealised model. Results The novel finding in this work is that wall compliance under the consideration of microcirculation leads to the increase of wall shear stress in contrast to rigid wall, contrary to the traditional result that wall compliance makes wall shear stress decrease when a constant or time dependent pressure is specified at an outlet. Conclusions This work provides the valuable study of hemodynamics under physiological and realistic boundary conditions and proves that wall compliance may have a positive impact on wall shear stress based on this model. This methodology in this paper could be used in real model simulations.

scholarly journals Assessment of low-fidelity fluid–structure interaction model for flexible propeller blades

2018 ◽  
Vol 78 ◽  
pp. 71-88 ◽  
Author(s):  
Jurij Sodja ◽  
Roeland De Breuker ◽  
Dejan Nozak ◽  
Radovan Drazumeric ◽  
Pier Marzocca
Keyword(s):  
Fluid Structure Interaction ◽  
Interaction Model ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Propeller Blades

scholarly journals An experimental investigation of the fluid structure interactions of a single curved nuclear fuel plate in a narrow channel

2017 ◽  
Author(s):  
◽  
Gerhard Schnieders
Keyword(s):  
Mass Flow ◽  
Flow Rate ◽  
Experimental Setup ◽  
Maximum Deflection ◽  
Test Plate ◽  
Fluid Structure ◽  
Research Reactors ◽  
Structure Interaction ◽  
Channel Thickness ◽  
Enriched Uranium

Nuclear research reactors are major scientific tools used by researchers all over the word to produce medical isotopes, irradiated materials, as well as study nuclear processes. Most fuel for research reactors is in the form of plates of uranium clad in aluminum. Forced water flows across the plates for cooling and reaction moderation. The Global Threat Reduction Initiative (GTRI) is an international effort to develop an acceptable low enriched uranium(LEU) fuel to replace the current high enriched uranium (HEU) fuel in research reactors. Because HEU fuel could be used for nuclear weapons, the goal of the GTRI is to prevent proliferation of HEU. The fuel plates and their assemblies must be redesigned using LEU fuel. Also, the LEU assemblies must fit the same profile within the reactors as the HEU assemblies and must provide a similar neutron distribution. The redesigned fuel plates will be thinner and the inter-plate coolant channels will be wider. The fluid structure interaction (FSI) between the fuel plates and coolant needs to be investigated to understand the potential for channel collapse. Channel collapse occurs when plates deflect to the point of touching the neighboring plate significantly cutting off coolant supply. Fluid structure interaction experiments were carried out to validate numerical FSI models that will be used to design structurally stable LEU fuel plates and assemblies. Past analysis has been conducted on flat and involute plates in single and multiple plate assemblies with channels of equal thickness. No previous experiments have been carried out on a curved plate with unequal channel gaps. The experimental setup consists of two stainless steel cylinders with a plate of 0.4604 mm thickness between them to form two flow channels. The inner channel is designed at 2.032 mm thickness and the outer channel thickness is 2.54 mm. The unequal channels are intended to simulate the maximum and minimum allowable channel thickness in the fuel assembly tolerances for the University of Missouri Research Reactor. The test plate is much thinner than the prototype fuel plate design in order to provide measurable deflections for the flow rates that are achievable in the current flow loop. Deflection is measured through plexiglass windows in the outer cylinder using a laser displacement sensor. The flow experiments showed that curved plates deflect into the initially larger channel and have a maximum deflection that increases at a rate greater than linearly with mass flow of the water. The maximum deflection measured was roughly 0.25 mm at a mass flow rate of 2.5 kg/s (average channel velocity of 4.4 m/s). When deflection is plotted against flow rate, a hysteresis is seen between subsequent sets of measurements throughout the experiment. The hysteresis was investigated and attributed to thermal expansion of the test plate due to the pump heating the circulating water. The experimental pressure results matched well with the numerical FSI models of the experimental setup.

scholarly journals Computational Approach for the Fluid-Structure Interaction Design of Insect-Inspired Micro Flapping Wings

Fluids ◽  
2022 ◽  
Vol 7 (1) ◽  
pp. 26
Author(s):  
Daisuke Ishihara
Keyword(s):  
Interaction Design ◽  
Fluid Structure Interaction ◽  
Systematic Investigation ◽  
Computational Approach ◽  
Flapping Wing ◽  
Flapping Wings ◽  
Dimensional Structure ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Dynamic Similarity

A flight device for insect-inspired flapping wing nano air vehicles (FWNAVs), which consists of the micro wings, the actuator, and the transmission, can use the fluid-structure interaction (FSI) to create the characteristic motions of the flapping wings. This design will be essential for further miniaturization of FWNAVs, since it will reduce the mechanical and electrical complexities of the flight device. Computational approaches will be necessary for this biomimetic concept because of the complexity of the FSI. Hence, in this study, a computational approach for the FSI design of insect-inspired micro flapping wings is proposed. This approach consists of a direct numerical modeling of the strongly coupled FSI, the dynamic similarity framework, and the design window (DW) search. The present numerical examples demonstrated that the dynamic similarity framework works well to make different two FSI systems with the strong coupling dynamically similar to each other, and this framework works as the guideline for the systematic investigation of the effect of characteristic parameters on the FSI system. Finally, an insect-inspired micro flapping wing with the 2.5-dimensional structure was designed using the proposed approach such that it can create the lift sufficient to support the weight of small insects. The existing area of satisfactory design solutions or the DW increases the fabricability of this wing using micromachining techniques based on the photolithography in the micro-electro-mechanical systems (MEMS) technology. Hence, the proposed approach will contribute to the further miniaturization of FWNAVs.

Numerical Study on the Performance Analysis and Vibration Characteristics of Flexible Marine Propeller

2020 ◽  
Author(s):  
Kumar S. Ashok ◽  
Subramanian V. Anantha ◽  
R. Vijayakumar
Keyword(s):  
Performance Analysis ◽  
Numerical Study ◽  
Open Water ◽  
Simulation Method ◽  
Mode Shapes ◽  
Thrust Coefficient ◽  
Fluid Structure ◽  
Marine Propellers ◽  
Water Characteristics ◽  
Wet Condition

Abstract This paper addresses the hydro-elastic performance of two composite marine propellers at operating condition and compares the results with conventional materials. The study involves three stages namely, design and development of a B series propeller, hydrodynamic and structural performance analysis in uniform flow and free vibration test both in dry and wet condition. In order to perform the hydro-elastic based fluid structure interaction (FSI), Co-Simulation method was adopted to couple Reynolds Averaged Navier-Strokes Equation (RANSE) based Computational Fluid Dynamics (CFD) solver and finite element method (FEM) solvers. The open water characteristics such as thrust coefficient (KT), torque coefficient (KQ), and open water efficiency (ηO) were analyzed as a function of advance velocity (J) of the propeller. A detailed study of the various blade materials by varying mechanical properties are presented. The results obtained show the variation of stress and deflection on the blade, along with the influence of the blade deformation on the performance of propeller. The vibration behaviour of the propellers were also analysed by Block-Lanczos method in FEM solver to obtain the natural frequencies and the mode shapes using Acoustic Fluid-Structure Coupling method for both dry and wet condition. Results showed that composite propeller have better hydro-dynamic property and lower vibration than metal propeller.

Fluid-Structure Interaction Simulations of Parachute Deployment and Inflation

2021 ◽  
Author(s):  
Liwu Wang ◽  
Mingzhang Tang ◽  
Yu Liu ◽  
Sijun Zhang
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Fluid Structure Interaction ◽  
Computational Approach ◽  
Computational Techniques ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Structure Dynamics ◽  
Computational Structure ◽  
Membrane Wrinkling

Abstract The numerical simulation of the parachute deployment/inflation process involves fluid structure interaction problems, the inherent complexities in the fluid structure interaction have been posing several computational challenges. In this paper a high fidelity Eulerian computational approach is proposed for the simulation of parachute deployment/inflation. Unlike the arbitrary Eulerian Lagrangian (ALE) method widely employed in this area, the Eulerian computational approach is established on three computational techniques: computational fluid dynamics, computational structure dynamics and computational moving boundary. A set of stationary, non-deforming Cartesian grids is adopted in our computational fluid dynamics, our computational structure dynamics is enhanced by non-linear finite element method and membrane wrinkling algorithm, instead of conventional computational mesh dynamics, an immersed boundary method is employed to avoid insurmountable poor grid quality brought in by moving mesh approaches. To validate the proposed numerical approach the deployment/inflation of C-9 parachute is simulated using our approach and the results show similar characteristics compared with experimental results and previous literature. The computed results have demonstrated the proposed method to be a useful tool for analyzing dynamic parachute deployment and subsequent inflation.

Investigation of Hydro-Elastic Performance of Marine Propellers Using Fluid-Structure Interaction Analysis

2015 ◽  
Author(s):  
Sangho Han ◽  
Hyoungsuk Lee ◽  
Min Churl Song ◽  
Bong Jun Chang
Keyword(s):  
Cfd Simulation ◽  
Interaction Analysis ◽  
Fluid Structure Interaction ◽  
Open Water ◽  
Elastic Interaction ◽  
Marine Propeller ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Wake Field ◽  
Propulsion Performance

To investigate the hydrodynamic benefits of composite materials marine propeller, CFD-FEM fluid structure interaction (FSI) methodology using STAR-CCM+ and Abaqus with co-simulation is adapted for the hydro-elastic interaction simulation of composite propeller. FSI simulation reliabilities are validated with experimental data of P5479 marine propeller. KP458 propeller geometry are used for CFD simulation of rigid blade and FSI simulation of flexible one under the propeller open water (POW) test condition and compared with conventional BEM-FEM results to understand the blade deformation characteristics and induced performance changes. KVLCC2-KP458 self-propulsion FSI simulations were conducted and confirmed the effect of unsteady behavior of flexible marine propeller for the propulsion performance in the wake field. From the results, the decided difference between rigid and flexible one is observed and the merits of flexible marine propeller is confirmed quantitatively.

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