Difference between revisions of "Liquid Wall Contact Law"
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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 that law. Simulations that use this contact law must insure that it only applies to contact involving that liquid material. | Note that this contact law uses the viscosity provided by the named <tt>liquidPhase</tt> property for all contact situations assigned that law. Simulations that use this contact law must therefore insure that it only applies to contact involving that liquid material by setting [[http://osupdocs.forestry.oregonstate.edu/index.php/Friction#Friction_in_Multimaterial_MPM|default or custom contact laws]] as needed. | ||
Revision as of 13:18, 2 March 2017
Description
This frictional contact law implements a friction-style contact between liquid and the 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 force is
[math]\displaystyle{ S_{slide} = k\ \eta(k\Delta v_t) \Delta v_t }[/math]
where k is a scaling factor (with units 1/length), [math]\displaystyle{ \eta(\dot\gamma) }[/math] is viscosity of a fluid (which may depend on shear rate), and [math]\displaystyle{ \Delta v_t }[/math] is the final difference in tangential velocities between fluid and the other material (usually a wall).
Properties
The properties for this law are:
| Property | Description | Units | Default |
|---|---|---|---|
| coeff | The scaling factor k in the contact law | 1/length units | 2 |
| 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 liquidPhase property for all contact situations assigned that law. Simulations that use this contact law must therefore insure that it only applies to contact involving that liquid material by setting [or custom contact laws] as needed.