Grid-Based Boundary Conditions - Revision history

Nairnj: /* Grid-Based Boundary Condition Commands */

2017-09-20T18:39:19Z

Grid-Based Boundary Condition Commands

← Older revision		Revision as of 18:39, 20 September 2017
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	The nodes that will get boundary conditions are selected by defining one [[2D MPM Shape Commands\|2D shape]] (for 2D simulations) or one [[3D MPM Shape Commands\|3D shape]] (for 3D simulations). The shape be a [[Nested Shapes\|nested shape]].		The nodes that will get boundary conditions are selected by defining one [[2D MPM Shape Commands\|2D shape]] (for 2D simulations) or one [[3D MPM Shape Commands\|3D shape]] (for 3D simulations). The shape be a [[Nested Shapes\|nested shape]].

	All nodes within the one shape will be set to all provided [[Setting Velocity and Transport Values\|velocity~~, temperature~~ and/or ~~concentration~~ conditions]].		All nodes within the one shape will be set to all provided [[Setting Velocity and Transport Values\|velocity and/or transport value conditions]].

	=== Deprecated Commands ===		=== Deprecated Commands ===

Nairnj at 18:38, 20 September 2017

2017-09-20T18:38:33Z

← Older revision		Revision as of 18:38, 20 September 2017
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	The nodes that will get boundary conditions are selected by defining one [[2D MPM Shape Commands\|2D shape]] (for 2D simulations) or one [[3D MPM Shape Commands\|3D shape]] (for 3D simulations). The shape be a [[Nested Shapes\|nested shape]].		The nodes that will get boundary conditions are selected by defining one [[2D MPM Shape Commands\|2D shape]] (for 2D simulations) or one [[3D MPM Shape Commands\|3D shape]] (for 3D simulations). The shape be a [[Nested Shapes\|nested shape]].

	All nodes within the one shape will be set to all provided [[Setting Velocity~~, Temperature,~~ and ~~Concentration~~\|velocity, temperature and/or concentration conditions]].		All nodes within the one shape will be set to all provided [[Setting Velocity and Transport Values\|velocity, temperature and/or concentration conditions]].

	=== Deprecated Commands ===		=== Deprecated Commands ===

Nairnj: /* Explicit Grid-Based Boundary Condition in XML Files */

2017-04-08T18:25:20Z

Explicit Grid-Based Boundary Condition in XML Files

← Older revision		Revision as of 18:25, 8 April 2017
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	</GridBCs>		</GridBCs>

	The <tt><BCShape></tt> blocks set boundary conditions as explained [[#Grid-Based Boundary Condition Commands\|above]]. The <tt><DisplacementBCs></tt> ~~blocks~~ lets you [[Explicit Grid Boundary Conditions\|explicitly list each grid point]]. The explicit method is limited to velocity conditions, and is usually generated with other software. You can use both [[#Grid-Based Boundary Condition Commands\|<tt><BCShape></tt> commands]] and a <tt><DisplacementBCs></tt> block in the same input file.		The <tt><BCShape></tt> blocks set boundary conditions as explained [[#Grid-Based Boundary Condition Commands\|above]]. The <tt><DisplacementBCs></tt> block lets you [[Explicit Grid Boundary Conditions\|explicitly list each grid point]]. The explicit method is limited to velocity conditions, and is usually generated with other software. You can use both [[#Grid-Based Boundary Condition Commands\|<tt><BCShape></tt> commands]] and a <tt><DisplacementBCs></tt> block in the same input file.

	== Layers of Boundary Conditions ==		== Layers of Boundary Conditions ==

Nairnj: /* Grid-Based Boundary Condition Commands */

2017-04-08T17:50:46Z

Grid-Based Boundary Condition Commands

← Older revision		Revision as of 17:50, 8 April 2017
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	== Grid-Based Boundary Condition Commands ==		== Grid-Based Boundary Condition Commands ==

	In scripted files, all grid-based boundary conditions are created by a series of <tt>GridBC</tt> command blocks that select nodes on the ~~grids~~:		In scripted files, all grid-based boundary conditions are created by a series of <tt>GridBC</tt> command blocks that select nodes on the grid:

	GridBC		GridBC

Nairnj: /* Grid-Based Boundary Condition Commands */

2017-04-08T17:50:35Z

Grid-Based Boundary Condition Commands

← Older revision		Revision as of 17:50, 8 April 2017
Line 6:		Line 6:
	== Grid-Based Boundary Condition Commands ==		== Grid-Based Boundary Condition Commands ==

	In scripted files, all grid-based boundary conditions are created by a series of <tt>GridBC</tt>command blocks that select nodes on the grids:		In scripted files, all grid-based boundary conditions are created by a series of <tt>GridBC</tt> command blocks that select nodes on the grids:

	GridBC		GridBC

Nairnj: /* Layers of Boundary Conditions */

2017-04-08T17:49:32Z

Layers of Boundary Conditions

← Older revision		Revision as of 17:49, 8 April 2017
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	== Layers of Boundary Conditions ==		== Layers of Boundary Conditions ==

	Grid boundary conditions are typcially placed ~~one~~ a layer of nodes that is outside the body defined by the material points and that layer defines the boundary. When using [[MPM Methods and Simulation Timing\|GIMP methods]], however, a particle near the boundary will interact with that boundary layer, but may also interact with nodes beyond a single row of boundary conditions. To prevent non-physical results from the extra nodes that are physcially outside the body, it may be necessary to set up two rows (or columns) of boundary conditions. For example, to have a rigid wall, set the velocity of two rows (or columns) or nodes to be zero. An alternative solution is to fill a boundary area with [[Rigid Material\|rigid particles]]. Rigid particle automatically create the required boundary conditions on two rows (or columns) of nodes.		Grid boundary conditions are typcially placed on a layer of nodes that is outside the body defined by the material points and that layer defines the boundary. When using [[MPM Methods and Simulation Timing\|GIMP methods]], however, a particle near the boundary will interact with that boundary layer, but may also interact with nodes beyond a single row of boundary conditions. To prevent non-physical results from the extra nodes that are physcially outside the body, it may be necessary to set up two rows (or columns) of boundary conditions. For example, to have a rigid wall, set the velocity of two rows (or columns) or nodes to be zero. An alternative solution is to fill a boundary area with [[Rigid Material\|rigid particles]]. Rigid particle automatically create the required boundary conditions on two rows (or columns) of nodes.

	Sometimes even two rows of boundary conditions will lead to artifacts in particles near the edges. These artifacts can be reduced by using [[MPM Grid Generation#Symmetry Planes\|symmetry planes]] or [[Rigid Material\|rigid particles]] with the <tt>mirrored</tt> property.		Sometimes even two rows of boundary conditions will lead to artifacts in particles near the edges. These artifacts can be reduced by using [[MPM Grid Generation#Symmetry Planes\|symmetry planes]] or [[Rigid Material\|rigid particles]] with the <tt>mirrored</tt> property.

Nairnj: /* Explicit Grid-Based Boundary Condition in XML Files */

2017-04-08T17:49:08Z

Explicit Grid-Based Boundary Condition in XML Files

← Older revision		Revision as of 17:49, 8 April 2017
Line 52:		Line 52:

	The <tt><BCShape></tt> blocks set boundary conditions as explained [[#Grid-Based Boundary Condition Commands\|above]]. The <tt><DisplacementBCs></tt> blocks lets you [[Explicit Grid Boundary Conditions\|explicitly list each grid point]]. The explicit method is limited to velocity conditions, and is usually generated with other software. You can use both [[#Grid-Based Boundary Condition Commands\|<tt><BCShape></tt> commands]] and a <tt><DisplacementBCs></tt> block in the same input file.		The <tt><BCShape></tt> blocks set boundary conditions as explained [[#Grid-Based Boundary Condition Commands\|above]]. The <tt><DisplacementBCs></tt> blocks lets you [[Explicit Grid Boundary Conditions\|explicitly list each grid point]]. The explicit method is limited to velocity conditions, and is usually generated with other software. You can use both [[#Grid-Based Boundary Condition Commands\|<tt><BCShape></tt> commands]] and a <tt><DisplacementBCs></tt> block in the same input file.

			== Layers of Boundary Conditions ==

			Grid boundary conditions are typcially placed one a layer of nodes that is outside the body defined by the material points and that layer defines the boundary. When using [[MPM Methods and Simulation Timing\|GIMP methods]], however, a particle near the boundary will interact with that boundary layer, but may also interact with nodes beyond a single row of boundary conditions. To prevent non-physical results from the extra nodes that are physcially outside the body, it may be necessary to set up two rows (or columns) of boundary conditions. For example, to have a rigid wall, set the velocity of two rows (or columns) or nodes to be zero. An alternative solution is to fill a boundary area with [[Rigid Material\|rigid particles]]. Rigid particle automatically create the required boundary conditions on two rows (or columns) of nodes.

			Sometimes even two rows of boundary conditions will lead to artifacts in particles near the edges. These artifacts can be reduced by using [[MPM Grid Generation#Symmetry Planes\|symmetry planes]] or [[Rigid Material\|rigid particles]] with the <tt>mirrored</tt> property.

Nairnj: /* Deprecated Commands */

2017-04-08T17:31:20Z

Deprecated Commands

← Older revision		Revision as of 17:31, 8 April 2017
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	* <tt>MoveArc</tt> and <tt><BCArc></tt>		* <tt>MoveArc</tt> and <tt><BCArc></tt>
	* <tt><LdRect></tt>		* <tt><LdRect></tt>
	* <tt>MoveBox and <tt><BCBox></tt>		* <tt>MoveBox</tt> and <tt><BCBox></tt>

	See [[Grid BC Shape Commands\|documentation]] for conversion of old commands to the new method.		See [[Grid BC Shape Commands\|documentation]] for conversion of old commands to the new method.

Nairnj: /* Explicit Grid-Based Boundary Condition in XML Files */

2017-04-08T17:26:45Z

Explicit Grid-Based Boundary Condition in XML Files

← Older revision		Revision as of 17:26, 8 April 2017
Line 51:		Line 51:
	</GridBCs>		</GridBCs>

	The <tt><BCShape></tt> blocks set boundary conditions as explained [[#Grid-Based Boundary Condition Commands\|above]]. The <tt><DisplacementBCs></tt> blocks lets you [[Explicit Grid Boundary Conditions\|explicitly list each grid point]]. The explicit method is limited to velocity conditions, and is usually generated with other software. You can use both [[#Grid-Based Boundary Condition Commands\|<tt><BCShape></tt> commands]] and a <tt><DisplacementBCs></tt> in the same input file.		The <tt><BCShape></tt> blocks set boundary conditions as explained [[#Grid-Based Boundary Condition Commands\|above]]. The <tt><DisplacementBCs></tt> blocks lets you [[Explicit Grid Boundary Conditions\|explicitly list each grid point]]. The explicit method is limited to velocity conditions, and is usually generated with other software. You can use both [[#Grid-Based Boundary Condition Commands\|<tt><BCShape></tt> commands]] and a <tt><DisplacementBCs></tt> block in the same input file.

Nairnj: /* Explicit Grid-Based Boundary Condition in XML Files */

2017-04-08T17:26:31Z

Explicit Grid-Based Boundary Condition in XML Files

← Older revision		Revision as of 17:26, 8 April 2017
Line 51:		Line 51:
	</GridBCs>		</GridBCs>

	The <tt><BCShape></tt> blocks set boundary conditions as explained [[#Grid-Based Boundary Condition Commands\|above]]. The <tt><DisplacementBCs></tt> blocks lets you [[Explicit Grid Boundary Conditions\|explicitly list each grid point]]. The explicit method is limited to velocity conditions, and is usually generated with other software. You can use both [[#Grid-Based Boundary Condition Commands\|<tt><BCShape></tt> commands]] and a ~~[[Explicit Grid Boundary Conditions\|~~<tt><DisplacementBCs></tt> ~~section]]~~ in the same input file.		The <tt><BCShape></tt> blocks set boundary conditions as explained [[#Grid-Based Boundary Condition Commands\|above]]. The <tt><DisplacementBCs></tt> blocks lets you [[Explicit Grid Boundary Conditions\|explicitly list each grid point]]. The explicit method is limited to velocity conditions, and is usually generated with other software. You can use both [[#Grid-Based Boundary Condition Commands\|<tt><BCShape></tt> commands]] and a <tt><DisplacementBCs></tt> in the same input file.