Force (EMP)

This report is available only for Eulerian Multiphase (EMP) simulations. The Force (EMP) report is similar to the Force report. It reports the moment exerted on each part due to interaction with the EMP phases.

The force on a surface is computed as:

Figure 1. EQUATION_DISPLAY

f = \sum_{f}^{} {(f_{f}^{p r e s s u r e} + f_{f}^{s h e a r}) \cdot n}_{f}

(426)

where:

$f_{f}^{p r e s s u r e}$ and $f_{f}^{s h e a r}$ are the pressure and shear force vectors on the surface face $f$ .
$n_{f}$ is a user-specified direction vector that indicates the direction in which to compute the force.

The Eulerian Multiphase (EMP) flow model assumes that the pressure is the same in all phases, therefore the pressure force vector on surface face is computed as:

Figure 2. EQUATION_DISPLAY

f_{f}^{p r e s s u r e} = (p_{f} - p_{r e f}) a_{f}

(427)

where $p_{f}$ is the face static pressure, $a_{f}$ is the face area vector, and $p_{r e f}$ is the reference pressure.

The Eulerian Multiphase (EMP) flow model solves the momentum conservation equations for each phase. The shear force is a function of the physical properties and velocity, therefore for EMP simulations the shear force exerted on the surface is the sum of the contributions from each phase, defined as:

Figure 3. EQUATION_DISPLAY

f_{f}^{s h e a r} = \sum_{i}^{} τ_{i, f} \cdot a_{f}

(428)

where $τ_{i, f}$ is the wall shear stress from phase $i$ at boundary face $f$ .

Force (EMP) Report Properties

In addition to constants, you can enter field function syntax directly.


Units	Units that are used for specifying the quantity.
Coordinate System	A list of coordinate systems in the simulation for use by this report.
Direction	A Cartesian vector that indicates the direction in which the force is computed.
Force Option	The forces (shear and pressure) that are considered in the computation of force.
	Shear	Only the force due to shear, $f_{f}^{s h e a r}$ in Eqn. (426) is considered.
	Pressure	Only the force due to pressure, $f_{f}^{p r e s s u r e}$ in Eqn. (426) is considered.
	Pressure + Shear	Both pressure and shear forces, $f_{f}^{p r e s s u r e}$ and $f_{f}^{s h e a r}$ in Eqn. (426) are considered.
Reference Pressure	The reference pressure for the computation of Eqn. (427).
Parts	A list of parts that are used as the source for this report. Opens the in-place part selector for editing. The (property customizer) button activates a modeless version of the selector dialog (it lets you interact with other portions of the workspace).

Force (EMP) Report Expert Properties


Number of Bands	A text entry for the number of bands into which to divide the model.
Representation	Selects a representation. Additional selections appear as representations that are added to the simulation.
Smooth Values	When this property is activated, the report is calculated using node (interpolated) values of the chosen quantity rather than cell values.