FEM ConstraintInitialFlowVelocity: Difference between revisions

Revision as of 20:30, 14 August 2022

Other languages:

Constraint electrostatic potential

Constraint initial pressure

FEM

Menu location
FEM ConstraintInitialFlowVelocity
Model → Fluid Constraints → Constraint initial flow velocity
Workbenches
FEM
Default shortcut
None
Introduced in version
-
See also
Constraint flow velocity, Constraint initial pressure

Description

Creates an initial flow velocity constraint for a fluid flow analysis.

Usage

- Either press the toolbar button FEM_ConstraintInitialFlowVelocity or select the menu Model → Fluid Constraints → Constraint initial flow velocity.
Enter an initial flow velocity value for the analysis. The value is entered as a combination of the 3 main cartesian vectors components (X,Y,Z).
For a 3D analysis, select a 'solid' (body) from your model, for a 2D analysis select a face.

Limitation

The constraint cannot be oriented other then using the main Cartesian components. This is a limitation of Elmer.

Notes

In the most simple analyses, it is not necessary to specify the initial flow velocity, however it is recommended as best practice.

Constraint electrostatic potential

Constraint initial pressure

FEM

FEM Analysis

Materials: Solid, Fluid, Nonlinear mechanical, Reinforced (concrete); Material editor

Element geometry: Beam (1D), Beam rotation (1D), Shell (2D), Fluid flow (1D)

Constraints

Electromagnetic: Electrostatic potential, Current density, Magnetization

Fluid: Initial flow velocity, Initial pressure, Flow velocity

Geometrical: Plane rotation, Section print, Transform

Mechanical: Fixed, Displacement, Contact, Tie, Spring, Force, Pressure, Centrif, Self weight

Thermal: Initial temperature, Heat flux, Temperature, Body heat source

Overwrite Constants: Constant vacuum permittivity

Mesh: Mesh Netgen, Mesh GMSH, Mesh boundary layer, Mesh region, Mesh group, Nodes set, Mesh to mesh

Solve: CalculiX Standard, Elmer, Mystran, Z88; Equations: Deformation, Elasticity, Electrostatic, Electricforce, Magnetodynamic, Magnetodynamic 2D, Flow, Flux, Heat; Solver: Solver control, Solver run

Results: Purge, Show; Postprocessing: Apply changes, Pipeline from result, Warp filter, Scalar clip filter, Function cut filter, Region clip filter, Contours filter, Line clip filter, Stress linearization plot, Data at point clip filter, Filter function plane, Filter function sphere, Filter function cylinder, Filter function box

Utilities: Clipping plane, Remove clipping planes, Open FEM examples; Mesh clear, Mesh display info

Additional: Preferences; FEM Install, FEM Mesh, FEM Solver, FEM CalculiX, FEM Concrete; FEM Element Types

User documentation

Getting started
Installation: Download, Windows, Linux, Mac, Additional components, Docker, AppImage, Ubuntu Snap
Basics: About FreeCAD, Interface, Mouse navigation, Selection methods, Object name, Preferences, Workbenches, Document structure, Properties, Help FreeCAD, Donate

Help: Tutorials, Video tutorials
Workbenches: Std Base, Arch, Assembly, CAM, Draft, FEM, Inspection, Mesh, OpenSCAD, Part, PartDesign, Points, Reverse Engineering, Robot, Sketcher, Spreadsheet, Start, Surface, TechDraw, Test Framework, Web

Addons: Addon Manager, External workbenches, Scripting and macros

Hubs: User hub, Power users hub, Developer hub

@@ Line 5: / Line 5: @@
 {{Docnav
 |[[FEM_ConstraintElectrostaticPotential|Constraint electrostatic potential]]
-|[[FEM_ConstraintFlowVelocity|Constraint flow velocity]]
+|[[FEM_ConstraintInitialPressure|Constraint initial pressure]]
 |[[FEM_Workbench|FEM]]
 |IconL=FEM_ConstraintElectrostaticPotential.svg
-|IconR=FEM_ConstraintFlowVelocity.svg
+|IconR=FEM_ConstraintInitialPressure.svg
 |IconC=Workbench_FEM.svg
 }}
@@ Line 17: / Line 17: @@
 |MenuLocation=Model → Fluid Constraints → Constraint initial flow velocity
 |Workbenches=[[FEM_Workbench|FEM]]
-|SeeAlso=[[FEM_ConstraintFlowVelocity|FEM Constraint flow velocity]]
+|SeeAlso=[[FEM_ConstraintFlowVelocity|Constraint flow velocity]], [[FEM_ConstraintInitialPressure|Constraint initial pressure]]
 }}
@@ Line 28: / Line 28: @@
 <!--T:9-->
+#* Either press the toolbar button {{Button|[[Image:FEM_ConstraintInitialFlowVelocity.svg|16px]] '''FEM_ConstraintInitialFlowVelocity'''}} or select the menu {{MenuCommand|Model → Fluid Constraints → [[Image:FEM_ConstraintInitialFlowVelocity.svg|16px]] Constraint initial flow velocity}}.
-# There are several ways to invoke the command:
+# Enter an initial flow velocity value for the analysis. The value is entered as a combination of the 3 main cartesian vectors components (X,Y,Z).
-#* Press the {{Button|[[Image:FEM_ConstraintInitialFlowVelocity.svg|16px]] [[FEM_ConstraintInitialFlowVelocity|FEM ConstraintInitialFlowVelocity]]}} button.
+# For a 3D analysis, select a 'solid' (body) from your model, for a 2D analysis select a face.
-#* Select the {{MenuCommand|Model → Fluid Constraints → [[Image:FEM_ConstraintInitialFlowVelocity.svg|16px]] Constraint initial flow velocity}} option from the menu.
-# Enter an initial flow velocity value for the analysis.
-# The value is entered as a combination of the 3 main cartesian vectors components (X,Y,Z).
-==Limitations== <!--T:11-->
+==Limitation== <!--T:11-->
 <!--T:12-->
-*The constraint applies the initial flow velocity to all nodes in the FEA model.
+*The constraint cannot be oriented other then using the main Cartesian components. This is a limitation of Elmer.
-*The constraint cannot be oriented other then using the main cartesian components.
 ==Notes== <!--T:13-->
@@ Line 49: / Line 46: @@
 {{Docnav
 |[[FEM_ConstraintElectrostaticPotential|Constraint electrostatic potential]]
-|[[FEM_ConstraintFlowVelocity|Constraint flow velocity]]
+|[[FEM_ConstraintInitialPressure|Constraint initial pressure]]
 |[[FEM_Workbench|FEM]]
 |IconL=FEM_ConstraintElectrostaticPotential.svg
-|IconR=FEM_ConstraintFlowVelocity.svg
+|IconR=FEM_ConstraintInitialPressure.svg
 |IconC=Workbench_FEM.svg
 }}