MPM Grid Generation - Revision history

Nairnj: /* Cell Sizes */

2026-04-10T17:28:26Z

Cell Sizes

← Older revision		Revision as of 17:28, 10 April 2026
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	<ul>		<ul>
	<li><tt>ratio</tt> gives ratio of adjacent cells in that direction outside AOIs. If <tt>ratio</tt> is not given, it is set to the golden ratio ((1+√5)/2=1.618). If y or z ~~directions~~ are not provided, they are set to the x direction ratio. Any ratio less than or equal to 1 is same as not provided.</li>		<li><tt>ratio</tt> gives ratio of adjacent cells in that direction outside AOIs. If x direction <tt>ratio</tt> is not given, it is set to the golden ratio ((1+√5)/2=1.618). If y or z direction <tt>ratio</tt>s are not provided, they are set to the x direction ratio. Any ratio less than or equal to 1 is same as not provided.</li>
	<li><tt>style</tt> has two options:		<li><tt>style</tt> has two options:
	<ol>		<ol>

Nairnj: /* Cell Sizes */

2026-04-10T17:27:37Z

Cell Sizes

← Older revision		Revision as of 17:27, 10 April 2026
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	<ul>		<ul>
	<li><tt>ratio</tt> gives ratio of adjacent cells in that direction outside AOIs. If ~~x direction~~ is not given, it is set to the golden ratio ((1+√5)/2=1.618). If y or z directions are not provided, they are set to the x direction ratio. Any ratio less than or equal to 1 is same as not provided.</li>		<li><tt>ratio</tt> gives ratio of adjacent cells in that direction outside AOIs. If <tt>ratio</tt> is not given, it is set to the golden ratio ((1+√5)/2=1.618). If y or z directions are not provided, they are set to the x direction ratio. Any ratio less than or equal to 1 is same as not provided.</li>
	<li><tt>style</tt> has two options:		<li><tt>style</tt> has two options:
	<ol>		<ol>

Nairnj: /* Tartan Grid */

2023-01-26T01:55:20Z

Tartan Grid

← Older revision		Revision as of 01:55, 26 January 2023
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	== Tartan Grid ==		== Tartan Grid ==

	A tartan grid extends regular grid methods by keeping the grid orthogonal but now allowing unequal cell sizes. Tartan grids currently limited to simulations with GIMP or CPDI [[MPM Methods and Simulation Timing\|shape functions]]. Axisymmetric calculations are ~~further~~ limited to CPDI shape functions. (~~note~~: although ~~Classis~~ shape functions can be used, they are not recommended).		A tartan grid extends regular grid methods by keeping the grid orthogonal but now allowing unequal cell sizes. Tartan grids currently limited to simulations with GIMP or CPDI [[MPM Methods and Simulation Timing\|shape functions]]. Axisymmetric calculations are limited to CPDI shape functions. (Note: although Classic [[MPM Methods and Simulation Timing\|shape functions]] can be used, they are not recommended).

	=== Areas of Interest ===		=== Areas of Interest ===

Nairnj: /* Tartan Grid */

2023-01-26T01:54:40Z

Tartan Grid

← Older revision		Revision as of 01:54, 26 January 2023
Line 63:		Line 63:
	== Tartan Grid ==		== Tartan Grid ==

	A tartan grid extends regular grid methods by keeping the grid orthogonal but now allowing unequal cell sizes. Tartan grids currently ~~work~~ with ~~Classic (not recommended),~~ GIMP, or CPDI [[MPM Methods and Simulation Timing\|shape functions]]. ~~Furthermore, axisymmetric~~ calculations are limited to CPDI shape functions.		A tartan grid extends regular grid methods by keeping the grid orthogonal but now allowing unequal cell sizes. Tartan grids currently limited to simulations with GIMP or CPDI [[MPM Methods and Simulation Timing\|shape functions]]. Axisymmetric calculations are further limited to CPDI shape functions. (note: although Classis shape functions can be used, they are not recommended).

	=== Areas of Interest ===		=== Areas of Interest ===

Nairnj: /* Tartan Grid */

2023-01-26T01:53:09Z

Tartan Grid

← Older revision		Revision as of 01:53, 26 January 2023
Line 63:		Line 63:
	== Tartan Grid ==		== Tartan Grid ==

	A tartan grid extends regular grid methods by keeping the grid orthogonal but now allowing unequal cell sizes. Tartan grids ~~are~~ currently ~~only available in [[OSParticulas]] and currently only~~ work with Classic (not recommended), GIMP, or CPDI [[MPM Methods and Simulation Timing\|shape functions]]. Furthermore, axisymmetric calculations are limited to CPDI shape functions.		A tartan grid extends regular grid methods by keeping the grid orthogonal but now allowing unequal cell sizes. Tartan grids currently work with Classic (not recommended), GIMP, or CPDI [[MPM Methods and Simulation Timing\|shape functions]]. Furthermore, axisymmetric calculations are limited to CPDI shape functions.

	=== Areas of Interest ===		=== Areas of Interest ===

Nairnj: /* Grid Limits and Border */

2021-06-12T01:14:08Z

Grid Limits and Border

← Older revision		Revision as of 01:14, 12 June 2021
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	=== Grid Limits and Border ===		=== Grid Limits and Border ===

	When using a tartan grid, set the limits of the grid ~~limits~~ (in <tt>GridRect</tt> or <tt><Grid></tt> commands) to the limits of the modeled object (''i.e.'', do not include extra border cells around the edges). This approach makes it easier to align object edges with cell edges in the tartan grid and to apply [[#Symmetry Planes\|symmetry boundary conditions]] on the object edges.		When using a tartan grid, set the limits of the grid (in <tt>GridRect</tt> or <tt><Grid></tt> commands) to the limits of the modeled object (''i.e.'', do not include extra border cells around the edges). This approach makes it easier to align object edges with cell edges in the tartan grid and to apply [[#Symmetry Planes\|symmetry boundary conditions]] on the object edges.

	If you want to add a border in scripted files, use the command:		If you want to add a border in scripted files, use the command:

Nairnj: /* Cell Sizes */

2021-06-12T01:12:23Z

Cell Sizes

← Older revision		Revision as of 01:12, 12 June 2021
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	<ul>		<ul>
	<li><tt>ratio</tt> gives ratio of adjacent cells in that direction outside AOIs. If x direction is not given, it is set to the golden ratio ((1+√5)/2=1.618). If y or z directions are not provided, ~~there~~ are set to the x direction ratio. Any ratio less than or equal to 1 is same as not provided.</li>		<li><tt>ratio</tt> gives ratio of adjacent cells in that direction outside AOIs. If x direction is not given, it is set to the golden ratio ((1+√5)/2=1.618). If y or z directions are not provided, they are set to the x direction ratio. Any ratio less than or equal to 1 is same as not provided.</li>
	<li><tt>style</tt> has two options:		<li><tt>style</tt> has two options:
	<ol>		<ol>
Line 104:		Line 104:
	<li>1 (or "linear"): the cell size will increase linearly by the amount (ratio-1)*a (where a is element size inside the AOI)</li>		<li>1 (or "linear"): the cell size will increase linearly by the amount (ratio-1)*a (where a is element size inside the AOI)</li>
	</ol>		</ol>
	XML files must use the numeric setting. If x direction is not given, it is set to "geometric". If y or z directions are not provided, ~~there~~ are set to the x direction style. Although this parameter is optional, it must be provided in scripted files for alignment when [[#Symmetry Planes\|symmetry plane]] boundary conditions are being set.		XML files must use the numeric setting. If x direction is not given, it is set to "geometric". If y or z directions are not provided, they are set to the x direction style. Although this parameter is optional, it must be provided in scripted files for alignment when [[#Symmetry Planes\|symmetry plane]] boundary conditions are being set.
	</li>		</li>
	</ul>		</ul>

Nairnj: /* Areas of Interest */

2021-06-12T01:10:50Z

Areas of Interest

← Older revision		Revision as of 01:10, 12 June 2021
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	<ul>		<ul>
	<li><tt>x1</tt> to <tt>x2</tt> and <tt>y2</tt> to <tt>y2</tt> define a rectangular AOI (add <tt>z1,z2,nz</tt> for cubical ~~volume~~ in 3D tartan grid). The mesh inside the area of interest will be a regular grid.</li>		<li><tt>x1</tt> to <tt>x2</tt> and <tt>y2</tt> to <tt>y2</tt> define a rectangular AOI (add <tt>z1,z2,nz</tt> for cubical AOI in a 3D tartan grid). The mesh inside the area of interest will be a regular grid.</li>
	<li>The <tt>nx</tt> and <tt>ny</tt> (and <tt>nz</tt> for 3D) values give the number of cells in the two (or three directions) inside the AOI (and the cells will have equal sizes along each direction.</li>		<li>The <tt>nx</tt> and <tt>ny</tt> (and <tt>nz</tt> for 3D) values give the number of cells in the two (or three directions) inside the AOI (and the cells will have equal sizes along each direction.</li>
	</ul>		</ul>

Nairnj: /* Areas of Interest */

2021-06-12T01:09:54Z

Areas of Interest

← Older revision		Revision as of 01:09, 12 June 2021
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	[[File:Mcintosh.png\|right]]		[[File:Mcintosh.png\|right]]
	A tartan grid is based around areas of interest (AOIs). Within AOIs, the grid is a regular grid of equal sized elements. Cells outside any AOI get larger. Cells between AOIs are also larger (depending on available space between the AOIs). Overlapping AOIs (by direction) combine into a single ''length'' of interest for that axis. The net result looks like a Scottish Tartan as shown in the picture to the right. This picture is the clan McIntosh tartan. The green areas ~~would~~ AOIs with regular cells and the cells get larger outside the AOIs, but all cell edges remain orthogonal.		A tartan grid is based around areas of interest (AOIs). Within AOIs, the grid is a regular grid of equal sized elements. Cells outside any AOI get larger. Cells between AOIs are also larger (depending on available space between the AOIs). Overlapping AOIs (by direction) combine into a single ''length'' of interest for that axis. The net result looks like a Scottish Tartan as shown in the picture to the right. This picture is the clan McIntosh tartan. The green areas represent AOIs with regular cells and the cells get larger outside the AOIs, but all cell edges remain orthogonal.

	AOIs are created in scripted files with:		AOIs are created in scripted files with:

Nairnj: /* Grid Limits and Border */

2021-06-11T19:44:25Z

Grid Limits and Border

← Older revision		Revision as of 19:44, 11 June 2021
Line 127:		Line 127:

	<ul>		<ul>
	<li><tt>xmin</tt>, <tt>xmax</tt>, <tt>ymin</tt>, and <tt>ymax</tt> give number of extra elements beyond the edges (which may be small or large elements depending on tartan grid settings (add <tt>zmin</tt> and <tt>zmax</tt> for 3D). Added elements will match the size of the last cell within the object in that direction.</li>		<li><tt>xmin</tt>, <tt>xmax</tt>, <tt>ymin</tt>, and <tt>ymax</tt> give number of extra elements beyond the edges, which may be small or large elements depending on tartan grid settings (add <tt>zmin</tt> and <tt>zmax</tt> for 3D). Added elements will match the size of the last cell within the object in that direction.</li>
	</ul>		</ul>