MPM Input Files - Revision history

Nairnj at 18:37, 12 April 2026

2026-04-12T18:37:21Z

← Older revision		Revision as of 18:37, 12 April 2026
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	* [[MPM Methods and Simulation Timing]] - these commands determine the MPM method to use, the time step, and the maximum simulations time.		* [[MPM Methods and Simulation Timing]] - these commands determine the MPM method to use, the time step, and the maximum simulations time.
	* [[Damping Options]] - these commands set up grid-based damping options.		* [[Damping Options]] - these commands set up grid-based damping options.
	* [[~~XPIC~~ Features\|~~XPIC~~(k) ~~and FMPM~~(k) Features]] - improved MPM ~~with~~ enhanced stability and noise ~~reduction~~		* [[FMPM Features\|FMPM(k) (or XPIC(k)) Features]] - improved MPM that approximates the full mass matrix inverse that can enhanced stability and reduce noise.
	* [[LeaveLimit Command]] - this command determines what happens when particles leave the grid.		* [[LeaveLimit Command]] - this command determines what happens when particles leave the grid.
	* [[DeleteLimit Command]] - this command determines what happens when particles get nan values.		* [[DeleteLimit Command]] - this command determines what happens when particles get nan values.
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	Custom tasks are special calculations that are performed at the end of each time step in MPM calculations. Custom tasks can be written by users working with [[NairnMPM]] source code. These user-defined custom tasks can then be scheduled when needed in some calculations. The current custom tasks are:		Custom tasks are special calculations that are performed at the end of each time step in MPM calculations. Custom tasks can be written by users working with [[NairnMPM]] source code. These user-defined custom tasks can then be scheduled when needed in some calculations. The current custom tasks are:

	* [[PeriodicXPIC Custom Task]] - implement [[~~Damping Options#XPIC~~ Features\|~~XPIC~~(m) simulations]] with an option to run them periodically instead of every time step		* [[PeriodicXPIC Custom Task]] - implement [[FMPM Features\|FMPM(k) simulations]] with an option to run them periodically instead of every time step
	* [[AdjustTimeStep Custom Task]] - to adjust time step during the calculations according to current stress state of the particles.		* [[AdjustTimeStep Custom Task]] - to adjust time step during the calculations according to current stress state of the particles.
	* [[VTKArchive Custom Task]] - to archive results extrapolated to the grid in "VTK Legacy" files.		* [[VTKArchive Custom Task]] - to archive results extrapolated to the grid in "VTK Legacy" files.

Nairnj: /* Using Explicit Cracks */

2024-04-26T21:48:48Z

Using Explicit Cracks

← Older revision		Revision as of 21:48, 26 April 2024
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	== Using Explicit Cracks ==		== Using Explicit Cracks ==

	An advanced feature of [[NairnMPM]] is that it can model explicit cracks including multiple cracks, interacting cracks, and crack propagation. To create a simultion with cracks, you first [[Defining Cracks\|define ~~2D cracks]] or [[3D Cracks\|3D~~ cracks]] and then optionally [[Crack Settings\|customize crack settings]] to customize crack modeling methods. To include crack propagation, you also need to set all needed [[Common Material Properties\|material fracture properties]]. By choosing a default [[Contact Laws\|contact law]] (or by choosing custom [[Contact Laws\|contact laws]] for each crack), crack surfaces can model either [[Friction\|frictional contact]] or model the crack plane as an [[Imperfect Interfaces\|imperfect interface]]. By adding [[Traction Laws\|traction laws]] to cracks, they can model cohesive zones.		An advanced feature of [[NairnMPM]] is that it can model explicit cracks including multiple cracks, interacting cracks, and crack propagation. To create a simultion with cracks, you first [[Defining Cracks\|define the cracks]] and then optionally [[Crack Settings\|customize crack settings]] to customize crack modeling methods. To include crack propagation, you also need to set all needed [[Common Material Properties\|material fracture properties]]. By choosing a default [[Contact Laws\|contact law]] (or by choosing custom [[Contact Laws\|contact laws]] for each crack), crack surfaces can model either [[Friction\|frictional contact]] or model the crack plane as an [[Imperfect Interfaces\|imperfect interface]]. By adding [[Traction Laws\|traction laws]] to cracks, they can model cohesive zones.

	== Multimaterial MPM ==		== Multimaterial MPM ==

Nairnj: /* Using Explicit Cracks */

2024-04-26T21:47:11Z

Using Explicit Cracks

← Older revision		Revision as of 21:47, 26 April 2024
Line 89:		Line 89:
	== Using Explicit Cracks ==		== Using Explicit Cracks ==

	An advanced feature of [[NairnMPM]] is that it can model explicit cracks including multiple cracks, interacting cracks, and crack propagation. To create a simultion with cracks, you first [[Defining Cracks\|define 2D cracks]] or [[~~Editing~~ 3D Cracks\|3D cracks]] and then optionally [[Crack Settings\|customize crack settings]] to customize crack modeling methods. To include crack propagation, you also need to set all needed [[Common Material Properties\|material fracture properties]]. By choosing a default [[Contact Laws\|contact law]] (or by choosing custom [[Contact Laws\|contact laws]] for each crack), crack surfaces can model either [[Friction\|frictional contact]] or model the crack plane as an [[Imperfect Interfaces\|imperfect interface]]. By adding [[Traction Laws\|traction laws]] to cracks, they can model cohesive zones.		An advanced feature of [[NairnMPM]] is that it can model explicit cracks including multiple cracks, interacting cracks, and crack propagation. To create a simultion with cracks, you first [[Defining Cracks\|define 2D cracks]] or [[3D Cracks\|3D cracks]] and then optionally [[Crack Settings\|customize crack settings]] to customize crack modeling methods. To include crack propagation, you also need to set all needed [[Common Material Properties\|material fracture properties]]. By choosing a default [[Contact Laws\|contact law]] (or by choosing custom [[Contact Laws\|contact laws]] for each crack), crack surfaces can model either [[Friction\|frictional contact]] or model the crack plane as an [[Imperfect Interfaces\|imperfect interface]]. By adding [[Traction Laws\|traction laws]] to cracks, they can model cohesive zones.

	== Multimaterial MPM ==		== Multimaterial MPM ==

Nairnj: /* Using Explicit Cracks */

2024-04-26T21:46:29Z

Using Explicit Cracks

← Older revision		Revision as of 21:46, 26 April 2024
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	== Using Explicit Cracks ==		== Using Explicit Cracks ==

	An advanced feature of [[NairnMPM]] is that it can model explicit cracks including multiple cracks, interacting cracks, and crack propagation. To create a simultion with cracks, you first [[Defining Cracks\|define ~~the~~ cracks]] and then optionally [[Crack Settings\|customize crack settings]] to customize crack modeling methods. To include crack propagation, you also need to set all needed [[Common Material Properties\|material fracture properties]]. By choosing a default [[Contact Laws\|contact law]] (or by choosing custom [[Contact Laws\|contact laws]] for each crack), crack surfaces can model either [[Friction\|frictional contact]] or model the crack plane as an [[Imperfect Interfaces\|imperfect interface]]. By adding [[Traction Laws\|traction laws]] to cracks, they can model cohesive zones.		An advanced feature of [[NairnMPM]] is that it can model explicit cracks including multiple cracks, interacting cracks, and crack propagation. To create a simultion with cracks, you first [[Defining Cracks\|define 2D cracks]] or [[Editing 3D Cracks\|3D cracks]] and then optionally [[Crack Settings\|customize crack settings]] to customize crack modeling methods. To include crack propagation, you also need to set all needed [[Common Material Properties\|material fracture properties]]. By choosing a default [[Contact Laws\|contact law]] (or by choosing custom [[Contact Laws\|contact laws]] for each crack), crack surfaces can model either [[Friction\|frictional contact]] or model the crack plane as an [[Imperfect Interfaces\|imperfect interface]]. By adding [[Traction Laws\|traction laws]] to cracks, they can model cohesive zones.

	== Multimaterial MPM ==		== Multimaterial MPM ==

Nairnj: /* Main Header */

2024-04-18T00:25:50Z

Main Header

← Older revision		Revision as of 00:25, 18 April 2024
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	* [[Processors Command]] - pick number of processors for parallel code.		* [[Processors Command]] - pick number of processors for parallel code.
	* [[Description Command\|Annotation Commands]] - these commands let you annotate the calculations.		* [[Description Command\|Annotation Commands]] - these commands let you annotate the calculations.
			* [[RandSeed Command]] - to pick a seed for random number generation
	~~Another command used~~ for ~~development purposes is:~~

	* [[Setting Developer Flags]]		* [[Setting Developer Flags]]

Nairnj: /* Boundary Conditions */

2023-11-17T17:23:08Z

Boundary Conditions

← Older revision		Revision as of 17:23, 17 November 2023
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	* [[Grid-Based Boundary Conditions]] - These boundary conditions are applied to nodes on the grid and are used to set velocity, temperature, and concentration. Grid-based velocity conditions can also set up object symmetry planes.		* [[Grid-Based Boundary Conditions]] - These boundary conditions are applied to nodes on the grid and are used to set velocity, temperature, and concentration. Grid-based velocity conditions can also set up object symmetry planes.
	* [[Particle-Based Boundary Conditions]] - ~~These~~ boundary conditions are applied to the particles ~~and are used to set~~ forces, tractions, and fluxes. ~~They can also~~ set in damage ~~on phase field values~~.		* [[Particle-Based Boundary Conditions]] - Most of the commands set boundary conditions that are applied to the particles for such things as forces, tractions, and fluxes. Some commands in these blocks instead set initial conditions for particle such as damage state.

	== Thermal Calculations ==		== Thermal Calculations ==

Nairnj: /* Boundary Conditions */

2023-11-17T17:16:10Z

Boundary Conditions

← Older revision		Revision as of 17:16, 17 November 2023
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	* [[Grid-Based Boundary Conditions]] - These boundary conditions are applied to nodes on the grid and are used to set velocity, temperature, and concentration. Grid-based velocity conditions can also set up object symmetry planes.		* [[Grid-Based Boundary Conditions]] - These boundary conditions are applied to nodes on the grid and are used to set velocity, temperature, and concentration. Grid-based velocity conditions can also set up object symmetry planes.
	* [[Particle-Based Boundary Conditions]] - These boundary conditions are applied to the particles and are used to set forces, tractions, and fluxes.		* [[Particle-Based Boundary Conditions]] - These boundary conditions are applied to the particles and are used to set forces, tractions, and fluxes. They can also set in damage on phase field values.

	== Thermal Calculations ==		== Thermal Calculations ==

Nairnj: /* Diffusion, Poroelasticity, or Other Transport Calculations */

2023-11-15T16:46:43Z

Diffusion, Poroelasticity, or Other Transport Calculations

← Older revision		Revision as of 16:46, 15 November 2023
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	Alternatively, MPM simulations can model [[Poroelasticity Calculations\|poroelastic materials]] and track pore pressure within a material saturated with fluid. The fluid transport between particles is modeled using Darcey's law. The pore pressure is coupled to changes in volume by [[Common_Material_Properties#Poroelasticity_Properties\|poroelasticity properties of the materials]].		Alternatively, MPM simulations can model [[Poroelasticity Calculations\|poroelastic materials]] and track pore pressure within a material saturated with fluid. The fluid transport between particles is modeled using Darcey's law. The pore pressure is coupled to changes in volume by [[Common_Material_Properties#Poroelasticity_Properties\|poroelasticity properties of the materials]].

	In additional to diffusion or poroelasticity (only one of which can be in any simulation), MPM simulations can ~~couple~~ [[Additional Transport Calculations\|~~Coupling~~ to ~~Other Transport Properties~~]] into the analysis.		In additional to diffusion or poroelasticity (only one of which can be in any simulation), MPM simulations can [[Additional Transport Calculations\|couple to other transport properties]] into the analysis.

	== Gravitation Field ==		== Gravitation Field ==

Nairnj: /* Diffusion, Poroelasticity, or Other Transport Calculations */

2023-11-15T16:45:57Z

Diffusion, Poroelasticity, or Other Transport Calculations

← Older revision		Revision as of 16:45, 15 November 2023
Line 114:		Line 114:
	Alternatively, MPM simulations can model [[Poroelasticity Calculations\|poroelastic materials]] and track pore pressure within a material saturated with fluid. The fluid transport between particles is modeled using Darcey's law. The pore pressure is coupled to changes in volume by [[Common_Material_Properties#Poroelasticity_Properties\|poroelasticity properties of the materials]].		Alternatively, MPM simulations can model [[Poroelasticity Calculations\|poroelastic materials]] and track pore pressure within a material saturated with fluid. The fluid transport between particles is modeled using Darcey's law. The pore pressure is coupled to changes in volume by [[Common_Material_Properties#Poroelasticity_Properties\|poroelasticity properties of the materials]].

	In additional to diffusion or poroelasticity (only one of which can be in any ~~simulations~~), MPM simulations can couple [[Additional Transport Calculations\|Coupling to Other Transport Properties]] into the analysis.		In additional to diffusion or poroelasticity (only one of which can be in any simulation), MPM simulations can couple [[Additional Transport Calculations\|Coupling to Other Transport Properties]] into the analysis.

	== Gravitation Field ==		== Gravitation Field ==

Nairnj: /* Diffusion, Poroelasticity, or Other Transport Calculations */

2023-08-01T00:01:12Z

Diffusion, Poroelasticity, or Other Transport Calculations

← Older revision		Revision as of 00:01, 1 August 2023
Line 114:		Line 114:
	Alternatively, MPM simulations can model [[Poroelasticity Calculations\|poroelastic materials]] and track pore pressure within a material saturated with fluid. The fluid transport between particles is modeled using Darcey's law. The pore pressure is coupled to changes in volume by [[Common_Material_Properties#Poroelasticity_Properties\|poroelasticity properties of the materials]].		Alternatively, MPM simulations can model [[Poroelasticity Calculations\|poroelastic materials]] and track pore pressure within a material saturated with fluid. The fluid transport between particles is modeled using Darcey's law. The pore pressure is coupled to changes in volume by [[Common_Material_Properties#Poroelasticity_Properties\|poroelasticity properties of the materials]].

	In additional to diffusion or poroelasticity (only one of which can be in any simulations), MPM simulations can couple [[~~additional transport properties~~\|Coupling to Other Transport Properties]] into the analysis.		In additional to diffusion or poroelasticity (only one of which can be in any simulations), MPM simulations can couple [[Additional Transport Calculations\|Coupling to Other Transport Properties]] into the analysis.

	== Gravitation Field ==		== Gravitation Field ==