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Journal of Fluids Engineering | Volume 128 | Issue 2 | TECHNICAL PAPERS
TECHNICAL PAPERS

A Multizone Moving Mesh Algorithm for Simulation of Flow Around a Rigid Body With Arbitrary Motion

[+] Author and Article Information
S. M. Mirsajedi

 Amirkabir University of Technology, Tehran, Iran, 15875-4413m7829904@aut.ac.ir

S. M. H. Karimian

 Amirkabir University of Technology, Tehran, Iran, 15875-4413hkarim@aut.ac.ir

M. Mani

 Amirkabir University of Technology, Tehran, Iran, 15875-4413mani@aut.ac.ir

J. Fluids Eng 128(2), 297-304 (Aug 26, 2005) (8 pages) doi:10.1115/1.2170124 History: Received March 21, 2005; Revised August 26, 2005
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In this paper, general motion of a two-dimensional body is modeled using a new moving mesh concept. Solution domain is divided into the three zones. The first zone, with a circular boundary, includes the moving body and facilitates the rotational motion of it. The second zone, with a square boundary, includes the first zone and facilitates the translational motion of the body. The third zone is a background grid in which the second zone moves. With this configuration of grids any two-dimensional motion of a body can be modeled with almost no grid insertion or deletion. However, in some stages of motion we merge or split a few number of elements. The discretization method is control-volume based finite-element, and the unsteady form of the Euler equations are solved using AUSM algorithm. To demonstrate the excellent performance of the present method two moving cases including rotational and translational motions are solved. The results show excellent agreement with experimental data or other numerical results.
Copyright © 2006 by American Society of Mechanical Engineers
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Figures

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+Grid configuration of present method
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Grid configuration of present method
Figure 1

Grid configuration of present method

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+Unstructured grid within the first zone
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Unstructured grid within the first zone
Figure 2

Unstructured grid within the first zone

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+First zone after body rotation
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First zone after body rotation
Figure 3

First zone after body rotation

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+Renumbering process for 360∕ndeg of rotation. (a) Old and new elements. (b) New elements after renumbering. (c) Whole domain after renumbering.
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Renumbering process for 360∕ndeg of rotation. (a) Old and new elements. (b) New elements after renumbering. (c) Whole domain after renumbering.
Figure 4

Renumbering process for 360∕ndeg of rotation. (a) Old and new elements. (b) New elements after renumbering. (c) Whole domain after renumbering.

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+Rotation (a) 20deg, (b) 40deg, and (c) 80deg of airfoil
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Rotation (a) 20deg, (b) 40deg, and (c) 80deg of airfoil
Figure 5

Rotation (a) 20deg, (b) 40deg, and (c) 80deg of airfoil

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+Cut cells with hanging nodes at the intersection of first and second zone
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Cut cells with hanging nodes at the intersection of first and second zone
Figure 6

Cut cells with hanging nodes at the intersection of first and second zone

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+(a) Second zone with one grid level, (b) second zone with larger boundary and two grid level
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(a) Second zone with one grid level, (b) second zone with larger boundary and two grid level
Figure 7

(a) Second zone with one grid level, (b) second zone with larger boundary and two grid level

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+Second zone motion on the background grid, (a) horizontal motion, before renumbering, (b) state (a) after renumbering, (c) oblique motion
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Second zone motion on the background grid, (a) horizontal motion, before renumbering, (b) state (a) after renumbering, (c) oblique motion
Figure 8

Second zone motion on the background grid, (a) horizontal motion, before renumbering, (b) state (a) after renumbering, (c) oblique motion

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+Simple deformation of an element due to the motion of its two nodes
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Simple deformation of an element due to the motion of its two nodes
Figure 9

Simple deformation of an element due to the motion of its two nodes

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+Formation of a control volume from subcontrol volumes within the surrounding elements
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Formation of a control volume from subcontrol volumes within the surrounding elements
Figure 10

Formation of a control volume from subcontrol volumes within the surrounding elements

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+Formation of a control volume around a hanging node
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Formation of a control volume around a hanging node
Figure 11

Formation of a control volume around a hanging node

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+Hybrid empty domain
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Hybrid empty domain
Figure 12

Hybrid empty domain

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+First test, contours of 1-ρ, after 2s of grid motion
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First test, contours of 1-ρ, after 2s of grid motion
Figure 13

First test, contours of 1-ρ, after 2s of grid motion

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+Computational grids for motion of cylinder
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Computational grids for motion of cylinder
Figure 14

Computational grids for motion of cylinder

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+Comparison of surface pressure distribution in front of the cylinder computed from unsteady and moving body simulation after (a) 5ms and (b) 10ms
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Comparison of surface pressure distribution in front of the cylinder computed from unsteady and moving body simulation after (a) 5ms and (b) 10ms
Figure 15

Comparison of surface pressure distribution in front of the cylinder computed from unsteady and moving body simulation after (a) 5ms and (b) 10ms

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+Comparison of the normal force coefficient loop of CT1 case, present and experimental data (34)
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Comparison of the normal force coefficient loop of CT1 case, present and experimental data (34)
Figure 16

Comparison of the normal force coefficient loop of CT1 case, present and experimental data (34)

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+Comparison of the normal force coefficient loop of CT5 case, Present and experimental data (34)
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Comparison of the normal force coefficient loop of CT5 case, Present and experimental data (34)
Figure 17

Comparison of the normal force coefficient loop of CT5 case, Present and experimental data (34)

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+Comparison of the normal force coefficient loop of CT5 case with Corrected αm to 0.25, present and experimental data (34)
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Comparison of the normal force coefficient loop of CT5 case with Corrected αm to 0.25, present and experimental data (34)
Figure 18

Comparison of the normal force coefficient loop of CT5 case with Corrected αm to 0.25, present and experimental data (34)

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