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See and rate the complete Learning Module

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Author: Rajesh Bhaskaran and Yong Sheng Khoo, Cornell
University

Problem Specification
1. Create Geometry in GAMBIT
2. Mesh Geometry in GAMBIT
3. Specify Boundary Types in GAMBIT
4. Set Up Problem in FLUENT
5. Solve!
6. Analyze Results
7. Refine Mesh
Problem 1
Problem 2

Step 7: Refine Mesh

Go to Problem 1

It our mesh refine enough? Will the current mesh give us an accurate representation of the physical flow? To determine this, we will have to carry out mesh sensitivity analysis. To do this, we will create a coarser mesh and a finer mesh. and compare all the three meshes together.

Pressure Coefficient Comparison

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 University

[Problem Specification|FLUENT - Steady Flow Past a Cylinder - Problem Specification]
[1. Create Geometry in GAMBIT|FLUENT - Steady Flow Past a Cylinder - Step 1]
[2. Mesh Geometry in GAMBIT|FLUENT - Steady Flow Past a Cylinder - Step 2]
[3. Specify Boundary Types in GAMBIT|FLUENT - Steady Flow Past a Cylinder - Step 3]
[4. Set Up Problem in FLUENT|FLUENT - Steady Flow Past a Cylinder - Step 4]
[5. Solve\!|FLUENT - Steady Flow Past a Cylinder - Step 5]
[6. Analyze Results|FLUENT - Steady Flow Past a Cylinder - Step 6]
{color:#ff0000}{*}7. Refine Mesh{*}{color}
[Problem 1|FLUENT - Steady Flow Past a Cylinder - Problem 1]
[Problem 2|FLUENT - Steady Flow Past a Cylinder - Problem 2]
{panel}

h2. Step 7: Refine Mesh

Go to [Problem 1|FLUENT - Steady Flow Past a Cylinder - Problem 1]<!--  /* Font Definitions */  @font-face 	{font-family:PMingLiU; 	panose-1:2 1 6 1 0 1 1 1 1 1; 	mso-font-alt:新細明體; 	mso-font-charset:136; 	mso-generic-font-family:auto; 	mso-font-format:other; 	mso-font-pitch:variable; 	mso-font-signature:1 134742016 16 0 1048576 0;} @font-face 	{font-family:"Cambria Math"; 	panose-1:2 4 5 3 5 4 6 3 2 4; 	mso-font-charset:0; 	mso-generic-font-family:roman; 	mso-font-pitch:variable; 	mso-font-signature:-1610611985 1107304683 0 0 159 0;} @font-face 	{font-family:Calibri; 	panose-1:2 15 5 2 2 2 4 3 2 4; 	mso-font-charset:0; 	mso-generic-font-family:swiss; 	mso-font-pitch:variable; 	mso-font-signature:-1610611985 1073750139 0 0 159 0;} @font-face 	{font-family:"\@PMingLiU"; 	panose-1:0 0 0 0 0 0 0 0 0 0; 	mso-font-charset:136; 	mso-generic-font-family:auto; 	mso-font-format:other; 	mso-font-pitch:variable; 	mso-font-signature:1 134742016 16 0 1048576 0;}  /* Style Definitions */  p.MsoNormal, li.MsoNormal, div.MsoNormal 	{mso-style-unhide:no; 	mso-style-qformat:yes; 	mso-style-parent:""; 	margin-top:0in; 	margin-right:0in; 	margin-bottom:10.0pt; 	margin-left:0in; 	line-height:115%; 	mso-pagination:widow-orphan; 	font-size:11.0pt; 	font-family:"Calibri","sans-serif"; 	mso-fareast-font-family:PMingLiU; 	mso-bidi-font-family:"Times New Roman";} .MsoChpDefault 	{mso-style-type:export-only; 	mso-default-props:yes; 	font-size:10.0pt; 	mso-ansi-font-size:10.0pt; 	mso-bidi-font-size:10.0pt; 	mso-ascii-font-family:Calibri; 	mso-fareast-font-family:PMingLiU; 	mso-hansi-font-family:Calibri;} @page Section1 	{size:8.5in 11.0in; 	margin:1.0in 1.0in 1.0in 1.0in; 	mso-header-margin:.5in; 	mso-footer-margin:.5in; 	mso-paper-source:0;} div.Section1 	{page:Section1;} -->It our mesh refine enough? Will the current mesh give us an accurate representation of the physical flow? Mesh density determine the truncation error of our simulation. With too little mesh density, the result we obtain will be inaccurate. With too many mesh elements,&nbsp; we will be wasting unnecessary computational power (long computational time\!). To get the optimum mesh density, we do mesh sensitivity analysis.


For this purpose, we will create three model with different mesh density. We will create a coarser mesh and a finer mesh and compare all the three meshes together.\\

Pressure Coefficient Comparison
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Drag Coefficient Comparison
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