Liquid Wall Contact Law - Revision history

Nairnj: /* Properties */

2026-03-26T18:23:28Z

Properties

← Older revision		Revision as of 18:23, 26 March 2026
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	\| LiquidPhase \|\| Enter the liquid phase material by ID (scripted files only) or by number \|\| none \|\| none		\| LiquidPhase \|\| Enter the liquid phase material by ID (scripted files only) or by number \|\| none \|\| none
	\|-		\|-
	\| displacementOnly \|\| Set to: 0 to detect contact when COD<0 <i>and</i> stress<0; 1 to detect contact whenever COD<0 regardless of stress; <0 to detect contact when COD<0 <i>and</i> stress<<tt>-displacementOnly<~~/tt~~> ~~(in [[ConsistentUnits Command#Legacy and Consistent Units\|pressure units]])\|\| none \|\| 0~~		\| displacementOnly<br>Dc \|\| These properties implemented some alternative methods for detecting contact. They are no longer implemented. If an old file enters values, the output for that contact law will explain the feature is "no longer used." \|\| none \|\| none
	\|-
	\| Dc \|\| ~~<0 to find separation assuming perfect interfaciall~~ contact, ~~≥0 to use [[Linear Imperfect Interface\|imperfect interface methods]] to find separation~~. \|\| ~~[[ConsistentUnits Command#Legacy and Consistent Units\|pressure/length units]]~~ \|\| none
	\|}		\|}

Nairnj at 20:00, 18 September 2020

2020-09-18T20:00:43Z

← Older revision		Revision as of 20:00, 18 September 2020
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	\| LiquidPhase \|\| Enter the liquid phase material by ID (scripted files only) or by number \|\| none \|\| none		\| LiquidPhase \|\| Enter the liquid phase material by ID (scripted files only) or by number \|\| none \|\| none
	\|-		\|-
	\| displacementOnly \|\| 0 ~~for~~ contact when COD<0 and stress<0, 1 ~~for~~ contact whenever COD<0, &~~ltl0 for~~ contact when COD<0 and stress<<tt>-displacementOnly</tt> (in [[ConsistentUnits Command#Legacy and Consistent Units\|pressure units]])\|\| none \|\| 0		\| displacementOnly \|\| Set to: 0 to detect contact when COD<0 <i>and</i> stress<0; 1 to detect contact whenever COD<0 regardless of stress; <0 to detect contact when COD<0 <i>and</i> stress<<tt>-displacementOnly</tt> (in [[ConsistentUnits Command#Legacy and Consistent Units\|pressure units]])\|\| none \|\| 0
	\|-		\|-
	\| Dc \|\| <0 to find separation assuming perfect interfaciall contact, ≥0 to use [[Linear Imperfect Interface\|imperfect interface methods]] to find separation. \|\| [[ConsistentUnits Command#Legacy and Consistent Units\|pressure/length units]] \|\| none		\| Dc \|\| <0 to find separation assuming perfect interfaciall contact, ≥0 to use [[Linear Imperfect Interface\|imperfect interface methods]] to find separation. \|\| [[ConsistentUnits Command#Legacy and Consistent Units\|pressure/length units]] \|\| none

Nairnj: /* Properties */

2019-08-14T18:59:18Z

Properties

← Older revision		Revision as of 18:59, 14 August 2019
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	\|-		\|-
	\| LiquidPhase \|\| Enter the liquid phase material by ID (scripted files only) or by number \|\| none \|\| none		\| LiquidPhase \|\| Enter the liquid phase material by ID (scripted files only) or by number \|\| none \|\| none
			\|-
			\| displacementOnly \|\| 0 for contact when COD<0 and stress<0, 1 for contact whenever COD<0, &ltl0 for contact when COD<0 and stress<<tt>-displacementOnly</tt> (in [[ConsistentUnits Command#Legacy and Consistent Units\|pressure units]])\|\| none \|\| 0
			\|-
			\| Dc \|\| <0 to find separation assuming perfect interfaciall contact, ≥0 to use [[Linear Imperfect Interface\|imperfect interface methods]] to find separation. \|\| [[ConsistentUnits Command#Legacy and Consistent Units\|pressure/length units]] \|\| none
	\|}		\|}

	Note that this contact law uses the viscosity provided by the entered <tt>LiquidPhase</tt> material for all contact situations assigned to the law. Simulations that use this contact law must therefore insure that it only applies to contact involving that liquid material by setting [[Friction#Friction in Multimaterial MPM\|default or custom contact laws]] as needed.		Note that this contact law uses the viscosity provided by the entered <tt>LiquidPhase</tt> material for all contact situations assigned to the law. Simulations that use this contact law must therefore insure that it only applies to contact involving that liquid material by setting [[Friction#Friction in Multimaterial MPM\|default or custom contact laws]] as needed.

			See [[Coulomb Friction Law#Comments on Parameters\|some comments]] about the <tt>displacementOnly</tt> and </tt>Dc</tt> parameters.

	== Examples ==		== Examples ==

Nairnj: /* Description */

2017-09-28T03:17:51Z

Description

← Older revision		Revision as of 03:17, 28 September 2017
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	== Description ==		== Description ==

	This [[Contact Laws#Frictional Contact Laws\|frictional contact law]] implements a friction-style contact between liquid and a wall where contact shear is related to shear rate, viscosity, and a scaling factor to vary from stick to slip contact~~. It is only available in [[OSParticulas]]~~. When the surfaces are in contact, the frictional sliding traction is		This [[Contact Laws#Frictional Contact Laws\|frictional contact law]] implements a friction-style contact between liquid and a wall where contact shear is related to shear rate, viscosity, and a scaling factor to vary from stick to slip contact. When the surfaces are in contact, the frictional sliding traction is

Nairnj: /* Properties */

2017-03-03T00:10:00Z

Properties

← Older revision		Revision as of 00:10, 3 March 2017
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	\|}		\|}

	Note that this contact law uses the viscosity provided by the ~~named~~ <tt>LiquidPhase</tt> ~~property~~ for all contact situations assigned to the law. Simulations that use this contact law must therefore insure that it only applies to contact involving that liquid material by setting [[Friction#Friction in Multimaterial MPM\|default or custom contact laws]] as needed.		Note that this contact law uses the viscosity provided by the entered <tt>LiquidPhase</tt> material for all contact situations assigned to the law. Simulations that use this contact law must therefore insure that it only applies to contact involving that liquid material by setting [[Friction#Friction in Multimaterial MPM\|default or custom contact laws]] as needed.

	== Examples ==		== Examples ==

Nairnj: /* Properties */

2017-03-03T00:09:12Z

Properties

← Older revision		Revision as of 00:09, 3 March 2017
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	\| coeff \|\| The scaling factor ''k'' in the contact law \|\| 1/[[ConsistentUnits Command#Legacy and Consistent Units\|length units]] \|\| 2		\| coeff \|\| The scaling factor ''k'' in the contact law \|\| 1/[[ConsistentUnits Command#Legacy and Consistent Units\|length units]] \|\| 2
	\|-		\|-
	\| ~~liquidPhase~~ \|\| Enter the liquid phase material by ID (scripted files only) or by number \|\| none \|\| none		\| LiquidPhase \|\| Enter the liquid phase material by ID (scripted files only) or by number \|\| none \|\| none
	\|}		\|}

	Note that this contact law uses the viscosity provided by the named <tt>~~liquidPhase~~</tt> property for all contact situations assigned to the law. Simulations that use this contact law must therefore insure that it only applies to contact involving that liquid material by setting [[Friction#Friction in Multimaterial MPM\|default or custom contact laws]] as needed.		Note that this contact law uses the viscosity provided by the named <tt>LiquidPhase</tt> property for all contact situations assigned to the law. Simulations that use this contact law must therefore insure that it only applies to contact involving that liquid material by setting [[Friction#Friction in Multimaterial MPM\|default or custom contact laws]] as needed.

	== Examples ==		== Examples ==

Nairnj: /* Examples */

2017-03-02T22:02:30Z

Examples

← Older revision		Revision as of 22:02, 2 March 2017
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	== Examples ==		== Examples ==

	These commands create a liquid contact law for "MyLiquid" (using scripted or ~~XML commands if liquid~~ material is number 1):		These commands create a liquid contact law for "MyLiquid" (using scripted commands) or material number 1 (using XML commands):

	Material "LiquidContact","Liquid Contact Law","LiquidContact"		Material "LiquidContact","Liquid Contact Law","LiquidContact"

Nairnj: /* Description */

2017-03-02T21:42:58Z

Description

← Older revision		Revision as of 21:42, 2 March 2017
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	Note that ''k'' = 0 leads to zero sliding traction, which is the same as frictionless contact (and could be done using a [[Coulomb Friction Law]] with it's <tt>coeff</tt> = 0). As ''k'' get large, the law approaches stick contact having <math>\Delta v_t\to 0</math> (and could be done using a [[Coulomb Friction Law]] with it's <tt>coeff</tt> = -1). All other values of ''k'' give partial-slip boundary conditions that depend on the liquid's viscosity and could be tailored to match experimental results.		Note that ''k'' = 0 leads to zero sliding traction, which is the same as frictionless contact (and could be done using a [[Coulomb Friction Law]] with it's <tt>coeff</tt> = 0). As ''k'' get large, the law approaches stick contact having <math>\Delta v_t\to 0</math> (and could be done using a [[Coulomb Friction Law]] with it's <tt>coeff</tt> = -1). All other values of ''k'' give partial-slip boundary conditions that depend on the liquid's viscosity and could be tailored to match experimental results.

	After running some simulations for a range of ''k'' and at different resolutions, those results indicate that ''k'' is a material property. In other words, ''k'' is independent of grid cell size, or only weakly dependent of grid cell size. A possible physical interpretation is that 1/''k'' is a "zone of influence" for the boundary region near a wall. If other problems show mesh dependence for ''k'', it could (and then should) varied with cell size.		After running some simulations for a range of ''k'' and at different resolutions, those results indicate that ''k'' is a material property. In other words, ''k'' is independent of grid cell size, or only weakly dependent of grid cell size. A possible physical interpretation is that 1/''k'' is a "zone of influence" for the boundary region near a wall. If other problems show mesh dependence for ''k'', it could (and then should) be varied with cell size.

	== Properties ==		== Properties ==

Nairnj: /* Description */

2017-03-02T21:42:37Z

Description

← Older revision		Revision as of 21:42, 2 March 2017
Line 11:		Line 11:
	Note that ''k'' = 0 leads to zero sliding traction, which is the same as frictionless contact (and could be done using a [[Coulomb Friction Law]] with it's <tt>coeff</tt> = 0). As ''k'' get large, the law approaches stick contact having <math>\Delta v_t\to 0</math> (and could be done using a [[Coulomb Friction Law]] with it's <tt>coeff</tt> = -1). All other values of ''k'' give partial-slip boundary conditions that depend on the liquid's viscosity and could be tailored to match experimental results.		Note that ''k'' = 0 leads to zero sliding traction, which is the same as frictionless contact (and could be done using a [[Coulomb Friction Law]] with it's <tt>coeff</tt> = 0). As ''k'' get large, the law approaches stick contact having <math>\Delta v_t\to 0</math> (and could be done using a [[Coulomb Friction Law]] with it's <tt>coeff</tt> = -1). All other values of ''k'' give partial-slip boundary conditions that depend on the liquid's viscosity and could be tailored to match experimental results.

	After running some simulations for a range of ''k'' and at different resolutions, those results indicate that ''k'' is a material property. In other words, ''k'' is independent of grid cell size, or only weakly dependent of grid cell size. A possible physical interpretation is that 1/''k'' is a "zone of influence'' for the boundary region near a wall. If other problems show mesh dependence for ''k'', it could (and then should) varied with cell size.		After running some simulations for a range of ''k'' and at different resolutions, those results indicate that ''k'' is a material property. In other words, ''k'' is independent of grid cell size, or only weakly dependent of grid cell size. A possible physical interpretation is that 1/''k'' is a "zone of influence" for the boundary region near a wall. If other problems show mesh dependence for ''k'', it could (and then should) varied with cell size.

	== Properties ==		== Properties ==

Nairnj: /* Description */

2017-03-02T21:40:01Z

Description

← Older revision		Revision as of 21:40, 2 March 2017
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	Note that ''k'' = 0 leads to zero sliding traction, which is the same as frictionless contact (and could be done using a [[Coulomb Friction Law]] with it's <tt>coeff</tt> = 0). As ''k'' get large, the law approaches stick contact having <math>\Delta v_t\to 0</math> (and could be done using a [[Coulomb Friction Law]] with it's <tt>coeff</tt> = -1). All other values of ''k'' give partial-slip boundary conditions that depend on the liquid's viscosity and could be tailored to match experimental results.		Note that ''k'' = 0 leads to zero sliding traction, which is the same as frictionless contact (and could be done using a [[Coulomb Friction Law]] with it's <tt>coeff</tt> = 0). As ''k'' get large, the law approaches stick contact having <math>\Delta v_t\to 0</math> (and could be done using a [[Coulomb Friction Law]] with it's <tt>coeff</tt> = -1). All other values of ''k'' give partial-slip boundary conditions that depend on the liquid's viscosity and could be tailored to match experimental results.

	By running simulations for a range of ''k'' and ~~for~~ different resolutions, ~~most~~ results ~~suggest~~ that ''k'' is a material property ~~(and therefore~~ independent of grid size). If other problems show mesh dependence for ''k'', it could ~~easily be~~ varied with cell size.		After running some simulations for a range of ''k'' and at different resolutions, those results indicate that ''k'' is a material property. In other words, ''k'' is independent of grid cell size, or only weakly dependent of grid cell size. A possible physical interpretation is that 1/''k'' is a "zone of influence'' for the boundary region near a wall. If other problems show mesh dependence for ''k'', it could (and then should) varied with cell size.

	== Properties ==		== Properties ==