CFD export to CGNS

You can export your model and solution results to the CFD General Notation System (CGNS) format. CGNS is a standard format for recording computational fluid dynamics (CFD) analysis data.

You export separately to CGNS:

• The finite element model with boundary conditions in the Simulation

• The solution results

Caution:

Set the solution units to meter (Newton) before exporting the CGNS file.

Exporting meshes and boundary conditions

When you export the finite element model and Simulation, the following data is exported to CGNS:

• Mesh entities:NodesElements

• Boundary conditions:TemperatureInlet information: velocity, mass flow, or static pressure riseOutlet information: velocity, mass flow, or static pressure riseOpening information: static pressureBoundary and embedded flow surfacesFluid density

The CGNS export interface lets you export unstructured zones with elements grouped by mesh and type. Elements are written in separate blocks mesh by mesh. Meshes with transition elements are written into separate blocks, one for each element type. Tapered beam meshes are also written in separate blocks, one block per beam.

For the elements where you apply boundary conditions, the software creates boundary elements with a normal pointing into the fluid.

Mesh and boundary condition names are also written to the CGNS file.

CGNS export does not support table data. For any defined temperature, velocity, mass flow, volume flow, or pressure that vary with time, the software exports the boundary condition into the CGNS format with a value equal to 0. Additionally, the software does not export any boundary condition values that are defined with spatial fields.

Exporting solution results

Depending on the 3D flow output requests you specify, the following results are exported to CGNS:

• Velocity

• Temperature

• Fluid density

• Static pressure

• Total pressure on walls

For more information, see CGNS output files.

Where do I find it?

Exporting the finite element model and the Simulation to CGNS file

Application	Pre/Post
Prerequisites	A Simulation file as the work part and displayed partSimcenter 3D Thermal/Flow or Simcenter 3D Electronic Systems Cooling as the specified solver
Command Finder	Export Simulation
Location in dialog box	File Type list→CGNS

Exporting solution results to CGNS files

Application	Pre/Post
Prerequisites	A Simulation file as the work part and displayed partSimcenter 3D Thermal/Flow, Simcenter 3D Electronic Systems Cooling, or Simcenter 3D Multiphysics as the specified solver
Command Finder	Solution
Simulation Navigator	Right-click a solution node→Edit
Location in dialog box	Results Options page→Optional Output Format subgroup→CGNS

How do I

Export thermal and flow data

Export primitives or elements for radiation modeling

Learn more

Exporting thermal and flow data

Look up more details

CGNS output files

Export options for Simcenter 3D Thermal/Flow, Electronic Systems Cooling, and Space Systems Thermal

Exported features of Primitives and their elements

Quick links

Command reference

Pre/Post video examples

Bulk Entry Descriptions

Simcenter 3D tutorials

Browse Simcenter 3D help by product area

CFD export to CGNS, Simcenter 3D 2021.1 Series

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