NUMERICAL SIMULATION OF STEADY FLOW IN A COMPLIANT TUBE OR CHANNEL WITH TAPERED WALL THICKNESS

2002 ◽  
Vol 16 (8) ◽  
pp. 1009-1027 ◽  
Author(s):  
E.B. SHIM ◽  
R.D. KAMM
Keyword(s):  
Numerical Simulation ◽  
Steady Flow ◽  
Wall Thickness

A Numerical Investigation on the Volute/Diffuser Interaction due to the Axial Distortion at Impeller Exit

2000 ◽  
Author(s):  
Fahua Gu ◽  
Abraham Engeda ◽  
Mike Cave ◽  
Jean-Luc Di Liberti
Keyword(s):  
Experimental Data ◽  
Numerical Simulation ◽  
Numerical Investigation ◽  
Steady Flow ◽  
Centrifugal Compressor ◽  
Vortex Structure ◽  
Flow Model ◽  
Single Stage ◽  
Mass Flows

Abstract A numerical simulation is performed on a single stage centrifugal compressor using the commercially available CFD software, CFX-TASCflow. The steady flow is obtained by circumferentially averaging the exit fluxes of the impeller. Three runs are made at design condition and off-design conditions. The predicted performance is in agreement with experimental data. The flow details inside the stationary components are investigated, resulting in a flow model describing the volute/diffuser interaction at design and off-design conditions. The recirculation and twin vortex structure are found to explain the volute loss increase at lower and higher mass flows, respectively.

scholarly journals LDA and PIV Analyses of In-Cylinder Steady Flow and Verifications of Numerical Simulation Results with Partial Cells Method

2004 ◽  
Vol 70 (694) ◽  
pp. 1618-1625 ◽  
Author(s):  
Tomokazu NOMURA ◽  
Yasushi TAKAHASHI ◽  
Chikashi TAKEDA ◽  
Tsuneaki ISHIMA ◽  
Tomio OBOKATA
Keyword(s):  
Numerical Simulation ◽  
Steady Flow ◽  
Simulation Results

The Proposal of Wall Thickness Management Criteria of T-Pipes

2012 ◽  
Author(s):  
Kiyoharu Tsunokawa ◽  
Taku Ohira ◽  
Naoki Miura ◽  
Yasumi Kitajima ◽  
Daisuke Yoshimura
Keyword(s):  
Numerical Simulation ◽  
Wall Thickness ◽  
Parametric Study ◽  
The Other ◽  
Wall Thinning ◽  
Study Results ◽  
Simulation Results ◽  
Design Construction

Although the reinforcement for openings is checked in accordance with design / construction standard when thinning was observed in T-pipes, this evaluation becomes too conservative or requires much time and effort. This paper describes additional parametric study results and proposes a guideline for thickness management of wall thinning T-pipes. On the other papers related to this project, the experiment and numerical simulation results are reported. This paper referred these results and performed further investigation.

Numerical Simulation of the Viscous Flow for the Supersonic Jet Element

2011 ◽  
Vol 189-193 ◽  
pp. 2362-2365
Author(s):  
Yong Yu ◽  
Guo Qing Zhang ◽  
Fei Wang
Keyword(s):  
Experimental Data ◽  
Numerical Simulation ◽  
Unsteady Flow ◽  
Viscous Flow ◽  
Steady Flow ◽  
Supersonic Jet ◽  
Calculated Data ◽  
Numerical Precision ◽  
Good Agreement

The viscous flow of the supersonic jet element was simulated numerically based on CFD technology, and many tests have been done to verify the numerical precision. The results show that the calculated data are good agreement with the experimental data. So the numerical simulation of the viscous flow for the supersonic jet element is accurate and reliable, and it can be applied to investigate the steady flow and unsteady flow in supersonic jet element.

Numerical Simulation of Seamless Tube’s Stretch Reducing Process

2011 ◽  
Vol 704-705 ◽  
pp. 155-159 ◽  
Author(s):  
Jun Hong Li ◽  
Hui Yu
Keyword(s):  
Numerical Simulation ◽  
Wall Thickness ◽  
Thickness Distribution ◽  
Rolling Process ◽  
Analysis Model ◽  
Element Analysis ◽  
Finite Element Analysis Model ◽  
Thickness Tolerance ◽  
Hot Rolled ◽  
Product Specifications

The stretch reducing process is the last hot deformation process of the hot-rolled seamless steel tube’s production. Its role is to decrease the tube’s diameter under the large tension and expand the range of product specifications. But the stretch reducing process often results in wall thickness tolerance at the head and end of the tube. In order to solve the problem, a 3D elastic-plastic finite element analysis model was established to simulate the stretch reducing process of φ159 unit. Based on this, the tube’s wall thickness distribution was studied and the parameters of sharpen rolling process was put forward. Numerical simulation results indicate that with the parameters of sharpen rolling process, the length of wall thickness tolerance was shorten and the rate of finished products was proved.

Effect of the Thickness of Dies for the Solidification Balance of Permanent Mould Casting AZ91D Magnesium Alloy

2009 ◽  
Vol 610-613 ◽  
pp. 750-753
Author(s):  
Jian Hua Zhao ◽  
Si Yuan Long ◽  
Hui Xu ◽  
Li Yan
Keyword(s):  
Numerical Simulation ◽  
Magnesium Alloy ◽  
Wall Thickness ◽  
Hot Spot ◽  
Experimental Results ◽  
Single Cycle ◽  
Chilling Effect ◽  
Az91d Magnesium Alloy ◽  
Mould Casting ◽  
Cooling Ability

The hot spot forming tendency during solidification of AZ91D magnesium alloy in permanent mould casting with the dies of different wall thickness via numerical simulation with Anycasting software was studied in the present paper. The experimental results showed that in a single cycle casting the increase in the thickness enhanced the cooling ability of the mould and promoted balanced solidification in a certain degree, while in multi-cycle casting, the thickened die-wall gradually lose its localized chilling effect. In contrast, the die with a decreased wall thickness in a certain range was easier to achieve the desired solidification balance.

External high-pressure forming of metal spiral tube of equal wall thickness

2020 ◽  
pp. 095440892096778
Author(s):  
Changshuai Shi ◽  
Jinping Li ◽  
Juan Deng ◽  
Xiaohua Zhu
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
High Pressure ◽  
Wall Thickness ◽  
Oil And Gas ◽  
Element Model ◽  
304 Stainless Steel ◽  
Spiral Tube ◽  
Positive Displacement ◽  
Tensile Experiment

Positive displacement motors are widely used underground power tools in oil and gas extraction. In order to solve the problems of the short life of the conventional positive displacement motor and the difficulty of machining the constant wall positive displacement motor, this paper proposes a metal bush stator. Based on theoretical analysis and tensile experiment of 304 stainless steel, a finite element model of an external high-pressure forming equal-wall-thickness metal spiral tube was established. The finite element method is used to study the external high pressure forming spiral tube with equal wall thickness. According to the results of the numerical simulation, we choose the tube blank with the inner diameter of 88 mm×the wall thickness of 3 mm for the experiment of external high pressure forming spiral tube. The result of the experiment is that the inner and outer surfaces of the metal spiral tube are smooth, and the spiral tube has no wrinkles or cracks. The maximum gap between the spiral tube and the mold is 0.12 mm, and the inner surface of the spiral tube is close to the mold. The maximum gap are at the transition of convex arc and concave arc. The minimum wall thickness and the maximum wall thickness of the spiral tube are 2.6 mm and 3.205 mm, respectively. The quality of the spiral tube is better when the inner circumference length of the tube (D2)/the contour line circumference (D1) of the mold is 0.974. The experimental results are in good agreement with the numerical simulation results. We have designed an assembled mold, which can be removed smoothly after the experiment. The research results of this paper have important engineering significance for improving the working performance of positive displacement motors.

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