|
•
|
For Sand roughness enter an Equivalent sand roughness height kseq (SI unit: m). The default is 3.2 micrometers.
|
•
|
For Generic roughness enter a Roughness height ks (SI unit: m). The default is 3.2 micrometers. Then enter a Roughness parameters Cs (dimensionless). The default is 0.26.
|
•
|
For Dispersed phase concentration enter a Dispersed phase volume fraction (dimensionless). The default is 0. When Solve for interfacial area is selected under the Physical Model section, click either the Dispersed phase number density n0 (SI unit: 1/m3) or Diameter of particles/droplets dd (SI unit: m) button and enter a value or expression for n0 (the default is 5·106 1/m3) or dd (the default is 1 mm).
|
•
|
For Dispersed phase flux enter values or expression for the Dispersed phase flux (SI unit: m/s) and, if Solve for interfacial area is selected under the Physical Model section, the Number density flux Νn (SI unit: 1/(m2⋅s)). The defaults are 0 m/s and 0 1/(m2⋅s), respectively.
|
•
|
For 3D components, values or expressions for the Velocity of sliding wall uw should be specified. If the velocity vector entered is not in the plane of the wall, COMSOL Multiphysics projects it onto the tangential direction. Its magnitude is adjusted to be the same as the magnitude of the vector entered.
|
•
|
For 2D components, the tangential direction is unambiguously defined by the direction of the boundary. For this reason, the sliding wall boundary condition has different definitions in different space dimensions. A single entry for the Velocity of the tangentially moving wall Uw should be specified in 2D.
|
•
|
For 2D axisymmetric components when Swirl flow is selected in the physics interface properties, the Velocity of moving wall, component vw may also be specified.
|
Wall in the Single-Phase Flow interfaces
|