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Boundary Conditions
Boundary Conditions available for SimSolid.
Pressure
Hydrostatic Pressure
Hydrostatic pressure is the pressure exerted by a fluid at rest due to gravity.

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Boundary Conditions
Boundary Conditions available for SimSolid.
- Available Boundary Conditions for Analyses
  A comparison chart showing the available boundary conditions for each analysis type.
- Constraints
- Pressure
  - Uniform Pressure
    Uniform pressure is a constant force applied perpendicular to a surface.
  - Hydrostatic Pressure
    Hydrostatic pressure is the pressure exerted by a fluid at rest due to gravity.
  - Imported Pressure
    Imported pressure allows you to bring in complex, non-uniform pressure distributions from other analysis software, typically Computational Fluid Dynamics (CFD) simulations.
  - Wind Load
    Wind load is the force exerted by wind on a structure.
- Force/Displacement
  Apply uniform loads and/or displacements to faces, edges, vertices, or spots.
- Gravity Load
  Simulate the force of gravity as it affects your model.
- Translational Inertia Load
  Apply a uniformly distributed translational inertia load over the volumes of the parts in an assembly.
- Rotational Inertia Load
  Apply a uniformly distributed rotational inertia load over the volumes of the parts in an assembly.
- Inertia Relief
  Simulate deformations and stresses in cases where you have an unconstrained structure to which an active load is suddenly applied.
- Remote Load
  Apply distributed loads (tractions) to faces, general virtual connector, or spots that are statistically equivalent to a load applied on a single point.
- Remote Displacement
  Apply displacements to faces and/or spots that are statistically equivalent to a load applied on a single point.
- Thermal Load
  Simulate deformations and stresses induced by the temperature changes in your model.
- Bearing Load
  Apply a varying pressure load to full or partial face(s) of revolution.
- Distributed Mass
  Apply distributed mass across selected faces.
- Bolt/Nut Tightening Loads
  Available for blind bolts (bolt without a nut), bolt with nut/bolt on threaded rod, nut on generic post or handle.
- Base Excitation
- Volume Expansion/Shrinkage
  Apply volumetric expansion/shrinkage coefficient over seam welds or other parts in the assembly.
- Temperature
  In thermal analysis, limit temperature on the selected faces, edges, vertices, or spots to a prescribed value.
- Thermal Convection
  In thermal analysis, define a convective heat exchange condition on faces and spots.
- Surface Heat Flux
  In thermal analysis, apply uniformly distributed heat loads to faces and spots.
- Volume Heat Loads
  In thermal analysis, simulate internal heat generation and internal heat absorption in volumes.
- Solar Loads
  Apply heat loads based on the sunbeam’s direction for thermal analysis
- Perfect Electric Conductor (PEC)
  Apply perfect electric conductor condition to faces.
- Waveguide Port
  Specify the excitation planes in waveguide structures.
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Frequently Asked Questions
This section provides quick responses to typical and frequently asked questions regarding

Hydrostatic Pressure

Hydrostatic pressure is the pressure exerted by a fluid at rest due to gravity.

The key characteristic of hydrostatic pressure is that it increases with depth. This is a crucial consideration for structures submerged in a liquid, such as dams, submarines, or the walls of a tank filled with water. The pressure at any point is proportional to the depth below the fluid's surface.

Apply Hydrostatic Pressure

Define pressure exerted by a fluid at equilibrium.

In the Project Tree, open the Analysis Workbench.
On the Analysis Workbench, click the ( pressure ) icon and choose Hydrostatic pressure.
In the modeling window, select faces to apply hydrostatic pressure to.
Optional: You can select the Add tangent faces check box.
Locate the fluid surface by defining the X, Y, and Z coordinates under Coordinates of a point at liquid surface.

Tip: You can also locate the coordinates in the modeling window using the graphical representation of the hydrostatic pressure load. Drag the ball around the model until it is in the desired position.
Define the Depth direction X, Y, and Z directions.
Specify units and value for Liquid density.
Specify units and value for Pressure at liquid surface.
Click OK.
The hydrostatic pressure load appears in the Project Tree. If selected, a graphic representation appears on the model.
Note: If a gravity direction is already defined, the depth direction uses this existing definition. In this case, you can locate the surfaces elevation, but not change its direction.

Densities of Common Substances

Common material densities. Use as reference examples only

Table 1. Material Densities
Material	Temperature (Celsius)	Density (kg/m³)
Acetone	25	785
Alcohol, propyl	25	800
Cement, Portland	--	1506
Concrete, gravel	--	2400
Fuel oil	15	890
Earth, packed	--	1520
Heating oil	20	920
Gasoline, natural	15	711
Gasoline, vehicle	15	737
Kerosene	15	820
Liquid Oxygen	-183	1140
Propane	-40	494
Sand, dry	--	1600
Sea water	25	1025
Water	4	1000