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How to Prepare the Fluid Region for Conjugate Heat Transfer Simulations?

For simulations involving conjugate heat transfer (CHT) analysis, the requirements for the simulation domain are slightly different from the normal procedure where we create a flow volume covering the negative of our overflowed geometry which represents the physical walls. This article describes how to proceed with CHT simulations ensuring the flow domain is accurately created.


A) Create Flow Volume and Keep Existing Parts

CHT simulation involves heat transfer through both solids and fluid. Hence, we need to keep the original solid parts while extracting the fluid volume as they participate in the heat transfer too. Accordingly, when we create the flow volume we need to keep the existing parts.

As an example, the following image shows the case of an electronics box:

keep existing parts while extracting flow volume in a cht simulation
Figure 1: Creating flow volume for an electronics box using Open inner region and keeping the existing parts

In order to understand the difference, the following picture shows both the results for a flow volume extracted with (right) and without keeping the existing parts (left):

difference between only fluid region and fluid region with original parts intact
Figure 2: Difference between not keeping (left) and keeping original parts (right) while performing the flow extraction operation


This is only necessary if you have a CHT simulation (or when you want to see the heat transfer through the walls/solids). In any other simulation you will get the same results, whether you keep the existing parts or not.

B) Imprint the Geometry

In order to know where the physical contacts between two solids are, we need to perform an imprint. This action basically cuts the interface between two bodies in physical contact into recognizable surfaces. Please refer to our article where a detailed explanation of what an imprint does is well mentioned.

As a result, when we create the CHT simulation, the tool detects the interfaces automatically. If you need to, you can further change the thermal properties of the interfaces.

automatically detected interfaces i cht
Figure 3: Interfaces are detected automatically once the Imprint operation is performed. Successful imprint operation is necessary to detect surfaces between parts which are in direct contact.

If the above example caught your interest, quickly jump to the Thermal Management: CHT Analysis of an Electronics Box tutorial where you will learn to visually inspect and manage the temperature distribution inside an electronics box.


If none of the above suggestions solved your problem, then please post the issue on our forum or contact us.

Last updated: November 10th, 2020

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