How to export your design to Ansys Fluent

Here is a video demonstrating the workflow to export surface meshes of heat exchanger geometry from nTop for conjugate heat transfer analysis in ANSYS Fluent. This video covers assigning boundary conditions in nTop and volume meshing the solid and fluid domains in ANSYS Fluent. Prior to watching the video, it is recommended to go through the following courses on nTop Learn to understand the process of designing and meshing complex geometry in nTop : 

  1. Multicourse: Heat Exchanger Design
  2. 102: Guide to Meshing
  3. Surface Meshing Best Practices


Relevant Files

nTop Example File

Solved ANSYS File



Here are the TUI Commands for merging multiple surfaces into a water-tight domain that can be pasted in the ANSYS Console for this example : 

  • objects/merge cold_wall cold_solid_int cold_inlet cold_outlet () cold_fluid
  • objects/merge hot_wall hot_solid_int hot_inlet hot_outlet () hot_fluid
  • objects/merge solid_wall solid_hot_int solid_cold_int () solid_hex

The general syntax is “objects/merge [boundary name 1] [boundary name 2] () [desired domain name]” . The boundary names will have to correspond to names assigned in nTop. The desired domain name is the name of the merged object.




Here are the TUI Commands for extracting the zone labels of the water-tight domain that can be pasted into the ANSYS Console for this example : 

  • objects/labels/create-label-per-zone cold_fluid cold_solid_int.1 cold_outlet.1 cold_inlet.1 cold_wall.1 ()
  • objects/labels/create-label-per-zone hot_fluid hot_solid_int.1 hot_outlet.1 hot_inlet.1 hot_wall.1 ()
  • objects/labels/create-label-per-zone solid_hex solid_cold_int.1 solid_hot_int.1 solid_wall.1 () 

The general syntax is “objects/labels/create-label-zone [boundary name 1].1 [boundary name 2].1 ()


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