Identifying flow enclosures

A model can be comprised of multiple flow enclosures. Each enclosure is a separate group of three-dimensional elements that form a distinct fluid domain. The fluids between each of these enclosures cannot mix. Each of these domains is represented by one or more polygon bodies.

Model with two enclosures: external air domain (1) and internal air domain (2)

The flow solver identifies each of these enclosures using unique IDs instead of polygon or mesh names. These IDs are used in the log file and convergence graphs, but it can be difficult to determine the polygon body and mesh from the ID number.

Identifying enclosures in the log file

In the log file, the flow solver writes all flow enclosures in the Sub-domains section:

 Sub-domains                                                                                          -----------                                                                                                                                                                                               Sub-domain Elements   Fluid                           Volume                                         ----------------------------------------------------------------------                                 1             956   Gas    : Air[3]                 9.2767E+05 mm^3                                  2            7760   Gas    : Air[3]                 1.1549E+08 mm^3                                ----------------------------------------------------------------------

For each flow enclosure, the log file contains:

• A unique ID

• The number of elements it contains

• The fluid type: gas or liquid

• The fluid material defined

• The volume of the flow enclosure

From this information, you can differentiate the flow enclosures. In this example, flow enclosure 1 has a smaller volume, which means that it is the internal air domain and, therefore, you can deduce that flow enclosure 2 is the external air domain.

Identifying enclosures from group.unv

The group.unv file, which contains groups that contain elements associated to warning or error messages in a solution, also contains flow enclosure groups called ENCLOSURE_. When you import group.unv, these groups are available under the Groups node in the Simulation Navigator. You can use the Show Only right-click command to easily identify the flow enclosures.

ENCLOSURE_0001: internal air domain

How do I

Import solution error and warning groups

Learn more

Workflow for thermal and flow analyses

Modeling additional heat paths

Modeling convection

Axisymmetric thermal modeling in non-axisymmetric solutions

Quick links

Command reference

Pre/Post video examples

Bulk Entry Descriptions

Simcenter 3D tutorials

Browse Simcenter 3D help by product area

Simcenter 3D Thermal/Flow, Electronic Systems Cooling, and Space Systems Thermal boundary conditions

Related Topics

Fluid material properties

Identifying flow enclosures, Simcenter 3D 2021.1 Series

© 2020 Siemens

window.mainLanguage="en_US"

window.delivId=""

window.projectId=""

MathJax.Hub.Config({ TeX: { extensions: ["autoload-all.js"] }, tex2jax: { displayMath: [ ] }, "SVG": { scale: 125 } });