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Fluid Section for 1-D Flow

In one sentence: Define hydraulic cross-section properties for edges modelled as 1-D pipe-flow elements in a CalculiX network flow analysis.

Overview

Workbench: FEM
Menu: FEM → Model → Element Geometry → Fluid Section for 1-D Flow

Defines the hydraulic properties of edges modelled as 1-D pipe-flow elements. Used with CalculiX's network flow analysis — fluid flowing through a network of pipes, channels, or orifices — rather than full 3-D CFD.

Properties

Property Description
Section Type Pipe, Sluice, Weir, etc.
Inner Radius Inner radius for circular pipe sections
Outer Radius Outer radius (for annular sections)
Manning Number Roughness coefficient for open-channel flow
Length Characteristic length when geometry is not explicit

When to use 1-D flow

1-D network flow analysis is appropriate when: - The flow path is simple (pipes, channels, orifices). - Only pressure drops and flow rates are needed — not detailed 3-D flow fields. - The full 3-D Elmer Navier-Stokes solver is too expensive.

See also