• Title, Summary, Keyword: OpenFOAM

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Verification of the Open Source Code, OpenFOAM to the External Flows (외부 유동 해석에 대한 오픈 소스 코드, OpenFOAM의 검증)

  • Kim, Tae-Woo;Oh, Se-Jong;Yee, Kwan-Jung
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.39 no.8
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    • pp.702-710
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    • 2011
  • This paper aims to verify the applicability of OpenFOAM, the widely recognized open source CFD code, to external flows commonly found in aeronautical problems. To this end, several representative flow cases are selected first from subsonic to supersonic flow fields. Then, the computational results obtained from OpenFOAM are systematically compared against available data from experiments and other numerical codes. It was found that the strength and location of shock are well predicted and the effects of boundary conditions on the computed results are reviewed. Subsonic flow with massive separation is selected to validate the prediction capability of OpenFOAM. Based on the current results, the limitation and possibility of OpenFOAM was confirmed and for future study using OpenFOAM was suggested.

Flow Analysis of the Oxidizer Manifold for a Liquid Rocket Combustor using OpenFOAM (OpenFOAM을 이용한 액체 로켓 연소기의 산화제 매니폴드 내 유동 해석)

  • Joh, Mi-Ok;Han, Sang-Hoon;Kim, Seong-Ku;Choi, Hwan-Seok
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.40 no.9
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    • pp.781-788
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    • 2012
  • Flow in the oxidizer manifold of a liquid rocket combustor has been analysed using an open source CFD toolbox, OpenFOAM. The applicability of OpenFOAM to the problems with complex geometries involving porous media zones for simulating the pressure drop induced by the injectors has been evaluated by performing turbulent, incompressible steady-state flow analysis. The usefulness and applicable area of the OpenFOAM as a design evaluation and analysis tool will be confirmed and enlarged by further evaluation with various computational cases representing major physical phenomena in rocket combustion devices.

Cryogenic Machining of Open-Cell Silicone Foam (액화질소를 이용한 오픈 셀 실리콘 폼의 냉동 절삭조건 최적화)

  • Hwang, Jihong;Cho, Kwang-Hee;Park, Min-Soo
    • Journal of The Korean Society of Manufacturing Technology Engineers
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    • v.23 no.1
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    • pp.32-37
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    • 2014
  • Open-cell silicon foam is difficult to cut using conventional machining processes because of its low stiffness. That is, open-cell silicon foam is easily pressed down when the tool is engaged, which makes it difficult to remove the material in the form of chip. This study proposes an advanced method of machining open-cell silicon foam by freezing the material using liquid nitrogen. Furthermore, the machining conditions are optimized to maximize the efficiency of material removal and minimize the usage of liquid nitrogen by conducting experiments under various machining conditions. The results show that open-cell silicone foam products with free surface can be successfully machined by employing the proposed method.

INTRODUCTION TO OPENFOAM: OPEN SOURCE SOFTWARE (Source 공개 코드 OpenFOAM 소개)

  • Park, J.K.;Kang, K.H.
    • 한국전산유체공학회:학술대회논문집
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    • pp.431-436
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    • 2010
  • Recently, several open source codes for computational fluid dynamics (CFD) have been emerged and are spreading fast. Our group has chosen OpenFOAM as a platform to develop our own in-house code. In this paper, we would like to share the information on the codes and what we have experienced so far. We introduce several features of OpenFOAM, which include the performance compared with commercial packages, estimation for current user population and our own prospect for future improvement in performance and growth in user population. In addition, we briefly introduce our experience gained in embedding the level set method into the OpenFOAM.

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REVIEW ON OPENFOAM - AN OPEN SOURCE SOFTWARE (Source 공개 코드 OpenFOAM에 대한 리뷰)

  • Park, J.K.;Kang, K.H.
    • Journal of computational fluids engineering
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    • v.15 no.3
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    • pp.46-53
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    • 2010
  • Recently, several open source codes for computational fluid dynamics (CFD) have been introduced and are spreading fast. Our group has chosen the OpenFOAM as a platform to develop our own in-house code. In this brief review, we would like to share the information on the codes and what we have experienced so far. We introduce several features of OpenFOAM, which include the performance compared with commercial packages, estimation for current user population, and our own prospect for future improvement in performance and growth in user population. In addition, we briefly introduce our experience gained in embedding the level set method into the OpenFOAM.

Effect of the Holding Temperature and Vacuum Pressure for the Open Cell Mg Alloy Foams

  • Yue, Xue-Zheng;Hur, Bo-Young
    • Korean Journal of Materials Research
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    • v.22 no.6
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    • pp.309-315
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    • 2012
  • Metal foam has many excellent properties, such as light weight, incombustibility, good thermal insulation, sound absorption, energy absorption, and environmental friendliness. It has two types of macrostructure, a closed-cell foam with sealed pores and an open-cell foam with open pores. The open-cell foam has a complex macrostructure consisting of an interconnected network. It can be exploited as a degradable biomaterial and a heat exchanger material. In this paper, open cell Mg alloy foams have been produced by infiltrating molten Mg alloy into porous pre-forms, where granules facilitate porous material. The granules have suitable strength and excellent thermal stability. They are also inexpensive and easily move out from open-cell foamed Mg-Al alloy materials. When the melt casting process used an inert gas, the molten magnesium igniting is resolved easily. The effects of the preheating temperature of the filler particle mould, negative pressure, and granule size on the fluidity of the open cell Mg alloy foam were investigated. With the increased infiltration pressure, preheat temperature and granule sizes during casting process, the molten AZ31 alloy was high fluidity. The optimum casting temperature, preheating temperature of the filler particle mould, and negative pressure were $750^{\circ}C$, $400-500^{\circ}C$, and 5000-6000 Pa, respectively, At these conditions the AZ31 alloy had good fluidity and castability with the longest infiltration length, fewer defects, and a uniform pore structure.

DEVELOPMENT OF OPENFOAM GRID GENERATION PROGRAM FOR TWO-DIMENSIONAL FLOW ANALYSIS (2차원 유동 해석을 위한 OpenFOAM용 격자 생성 프로그램 개발)

  • Kim, W.H.;Kim, B.S.
    • Journal of computational fluids engineering
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    • v.21 no.2
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    • pp.25-31
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    • 2016
  • In this paper, a study on the development of OpenFOAM grid generation program for two-dimensional flow analysis is described. By using the pre-processor(eMEGA) of EDISON_CFD system, grids for OpenFOAM flow calculation were obtained. Resultant two-dimensional grids were used to calculate flow fields by applying simpleFoam, one of the OpenFOAM's popular solvers, and the obtained flow results were compared with theoretical and experimental data available. Also grids generated by present program were compared with grids by a commercial pre-processor Pointwise for the purpose of verification. Verification work includes three cases(single block, O-type single block, and multi block grid), and all results show reasonable matches. According to the current achievement, it can be concluded that OpenFOAM grid can be constructed conveniently by using eMEGA with GUI.

Numerical study of the flow smulation and visualization in the co-extrusion die using OpenFOAMⓇ (OpenFOAMⓇ을 이용한 공압출기 다이 내부 유동 모사 및 가시화에 관한 수치 연구)

  • Mun, Jun Ho;Kim, Ju Hyeon;Mun, Sang Ho;Kim, See Jo
    • Journal of the Korean Society of Visualization
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    • v.11 no.3
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    • pp.5-11
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    • 2013
  • It is of great importance to obtain the uniform layer thickness in the multi-layer co-extrusion processes. In the present study, the three-dimensional numerical simulation was carried out using the open source code named OpenFOAM(R) to understand the flow characteristics in the multi-layer die. In this numerical study, Multi-thin-layers were successfully computed depending on the number of repeating units. The generation mechanism for the multi-layer was numerically verified by the flow simulation and visualization in the co-extrusion die using OpenFOAM(R). The results suggested that the multi-layer has a divided and folded mechanism similar to the stretching and folding in the chaotic flow.

Direct Numerical Simulations of Turbulent Boundary Layer using OpenFOAM and Adapted Mesh (OpenFOAM과 어댑티드 격자를 이용한 난류 경계층의 직접 수치 모사)

  • Lee, Sang Bong
    • Journal of the Society of Naval Architects of Korea
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    • v.53 no.3
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    • pp.210-216
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    • 2016
  • Direct numerical simulations of a spatially developing turbulent boundary layer on a flat plate have been performed to verify the applicability of OpenFOAM and adapted mesh with prism layers to turbulent numerical simulation with high fidelity as well as provide a guideline on numerical schemes and parameters of OpenFOAM. Reynolds number based on a momentum thickness at inlet and a free-stream velocity was Reθ=300. Time dependent inflow fields with near-wall turbulent structures were generated by a method of Lund et al. (1998), which was to extract instantaneous velocity fields from an auxiliary simulation with rescaled and recycled velocities at inlet. To ascertain the statistical characteristics of turbulent boundary layer, the mean profiles of streamwise velocity and turbulent intensities obtained from structured and adapted meshes were compared with the previous data.

Polyurethane foam-cadmium sulfide nanocomposite with open cell structure: Dye removal and antibacterial applications

  • Dorraji, Mir Saeid Seyed;Ashjari, Hamid Reza;Rasoulifard, Mohammad Hossein;Rastgouy-Houjaghan, Mehrdad
    • Korean Journal of Chemical Engineering
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    • v.34 no.2
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    • pp.547-554
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    • 2017
  • A new way to synthesize open cell polyurethane foam using cadmium ions has been described. By converting to cadmium sulfide nanoparticles, cadmium ions have been fixed on the open cell polyurethane foam. Open cell polyurethane foam containing CdS nanoparticles (PUF-CdS) was characterized by X-Ray diffraction (XRD), scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FT-IR). The SEM results showed foam containing nanoparticles unlike pure foam (PUF) has an open cell structure. In the following, the applicability of synthesized nanocomposite in wastewater treatment was investigated. The dye removal efficiency of PUF-CdS was investigated with the objective of removing Reactive Orange 122 (RO122) as a model pollutant from aqueous solution. The effects of adsorbent dosage, initial dye concentration and initial pH of solution on RO122 removal were studied. Kinetics and equilibrium isotherms for adsorption of dye on PUF-CdS were analyzed. The maximum adsorption capacity obtained from Langmuir isotherm equation was $22.7mg\;g^{-1}$. The experimental data were adjusted to the pseudo-second-order kinetic model. The antibacterial activity of PUF-CdS was also investigated against E. coli and S. aureus.