Pipe Pressure

Pipe is generally used for transfer the fluid from one point to another. These fluid exert some pressure on pipe. This is called generally internal pressure. In some region, where we have to deal with snow region or water zone like ocean. In this region, there is generated external pressure, which try to compress the pipe.

In ANSYS, this boundary condition is applied only to pipe in the form of line bodies. This is very useful for pipe design and pipe stress analysis.

Analysis Type – This boundary condition are available in only following ANSYS Analysis type

• Static Structural
• Transient Structural
• Explicit Dynamics
• Harmonic Response

Properties of Boundary Condition

Dimensional Analysis

• 3D Simulation: Supported
• 2D Simulation:  Not Supported

Geometry Type

• Solid: Not Supported
• Surface/Shell: Not Supported
• Wire body/ line body / Beam: Supported, line bodies only

Topology

• Body: Not Supported
• Face: Not Supported
• Edge: Supported
• Vertex: Not Supported
• Node: Not Supported

Hydrostatic Pressure

Hydrostatic pressure is the pressure that is exerted by a fluid at equilibrium at a given point within the fluid, due the force of gravity. Hydrostatic pressure increases proportional to depth measured from the surface because of the increasing weight of fluid exerting downward force from above.

                                                                  P = rho x g x h

                                                      Where p = pressure

                                                                 Rho  = density of fluid

                                                                 G = gravity acceleration

                                                                  h = height of fluid above the object

In ANSYS, hydrostatic pressure load simulates pressure that occurs due to fluid weight.

Analysis Type – This boundary condition are available in only following ANSYS Analysis type

• Static Structural
• Transient Structural
• Explicit Dynamics

Properties of Boundary Condition

Dimensional Analysis

• 3D Simulation: Supported
• 2D Simulation: Supported

Geometry Type

• Solid: Supported
• Surface/Shell: Supported
• Wire body/ line body / Beam: Supported

Topology

• Body: Not Supported
• Face: Supported -3D
• Edge: Supported-2D
• Vertex: Not Supported
• Node: Not Supported

Moment

The moment of a force is a measure of its tendency to cause a body to rotate about a specific point or axis. For developing moment, the force must act upon the body in such a manner that the body would begin to twist. The magnitude of the moment of a force acting about a point or axis is directly proportional to the distance of the force from the point or axis.

M = F . d

The unit of moment is newton –meter (N-m). A moment also have sense; a clockwise rotation about the center of moment will be considered as positive moment, while a counter-clockwise rotation about the center of moment will be considered negative.

In ANSYS, this boundary condition distributes a moment “about” (the vector of) an axis across one or more flat or curved faces, or about one or more edge or vertex.

Moment boundary condition classified as a remote boundary condition in ansys.

Analysis Type – This boundary condition are available in only following ANSYS Analysis type

• Static Structural
• Transient Structural
• Harmonic Response

Properties of Boundary Condition

Dimensional Analysis

• 3D Simulation: Supported
• 2D Simulation: Supported

Geometry Type

• Solid: Supported
• Surface/Shell: Supported
• Wire body/ line body / Beam: Supported

Topology

• Body: Not Supported
• Face: Supported -3D
• Edge: Supported
• Vertex: Supported
• Node: Supported

Pressure

Pressure is defined as force per unit area. The standard unit for pressure is Pascal, which is equal to 1 Newton per square meter.

Pressure = Force / Area  =  F/A

It is generally applied perpendicular to the applied surface.

In ANSYS, Pressure load applies a constant pressure or a varying pressure in a single direction (x, y or z) to one or more flat or curved surface.

A positive value of pressure act toward the face, compressing the body. A negative value of pressure act opposite to the face, form tension in body.

Analysis Type – This boundary condition are available in only following ANSYS Analysis type

• Static Structural
• Transient Structural
• Harmonic Response
• Explicit Dynamics

Properties of Boundary Condition

Dimensional Analysis

• 3D Simulation: Supported
• 2D Simulation: Supported

Geometry Type

• Solid: Supported
• Surface/Shell: Supported

Topology

• Body: Not Supported
• Face: Supported – 3D
• Edge: Supported – 2D
• Vertex: Not Supported
• Node: Not Supported

If you select multiple face or edge, when defining the pressure, the same pressure value gets applied to all selected face or edge.