Boundary conditions > Simulation objects > Simcenter 3D Thermal/Flow, Electronic Systems Cooling, and Space Systems Thermal simulation objects > Flow Boundary Condition
External Conditions
Use an External Conditions type modeling object to define the temperature and humidity of the fluid entering the fluid domain. Once created, you can select an External Conditions modeling object when defining an Inlet, Opening, or Static Pressure type Flow Boundary Condition simulation object. In this way, you can specify that these conditions exist at a given location or at many locations in the model.
Note:
If you want to specify the same external conditions for all fluid entering the fluid domain, set the options on the Ambient Conditions page of the Solution dialog box instead of creating the External Conditions modeling object.
The default settings for temperature and humidity in the External Conditions dialog box are Ambient. Since this settings are identical to the default setting of the flow solver, there is no need to create an External Conditions modeling object option set to default.
Where do I find it?
| Application | Pre/Post |
|---|---|
| Command Finder | Modeling Objects |
| Menu | Insert→Modeling Objects |
| Location in dialog box | Type list→External Conditions→Create |
How do I
Create a Flow Boundary Condition
Learn more
Flow Boundary Condition types
Modeling fan swirl
Working with fan curves
Modeling heat loss or gain in a recirculation loop
Flow boundary condition modeling
Fan Speed Controller
Inputs to expressions
Look up more details
Auto-generated expressions
Quick links
Simcenter 3D Thermal/Flow, Electronic Systems Cooling, and Space Systems Thermal boundary conditions
Thermal/Flow, Electronic Systems Cooling, and Space Systems Thermal
Command reference
Pre/Post video examples
Bulk Entry Descriptions
Simcenter 3D tutorials
Browse Simcenter 3D help by product area
External Conditions, 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 } });
Source: https://docs.sw.siemens.com/en-US/doc/289054037/PL20200601120302950.advanced/id628436 · retrieved 2026-07-17