STAR-CCM+ Tutorial | Conjugate Heat Transfer | Part 8 – Boundary Condition | Advanced

In this STAR-CCM+ tutorial, we demonstrate how to model conjugate heat transfer (CHT) between a solid and a gas.
The video covers the complete workflow, from region definition and interface creation to physics setup and post-processing of temperature and heat flux.

This tutorial is ideal for anyone learning thermal CFD simulations in STAR-CCM+, especially applications involving solid–fluid heat exchange.

🔹 What you’ll learn
0:00 Introduction to conjugate heat transfer (CHT)
0:XX Geometry and region setup (solid and gas)
0:XX Creating solid–fluid interfaces
0:XX Material properties and thermal models
0:XX Meshing strategy for CHT simulations
0:XX Solver settings and convergence monitoring
0:XX Post-processing temperature fields and heat flux
0:XX Common pitfalls and best-practice tips

📂 Case details
– Software: Simcenter STAR-CCM+
– Topic: Conjugate heat transfer between solid and gas
– Physics: Energy equation, heat conduction, convection
– Outputs: Temperature distribution, heat flux, thermal gradients

🎓 About this series – Abecator CFD
This video is part of the STAR-CCM+ tutorial series on the Abecator CFD channel.
The series focuses on practical engineering simulations to help students, researchers, and engineers build strong CFD fundamentals.

👍 Support the channel
– Like the video if it helped you
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– Leave a comment with your questions or suggested future topics


In this part of the exercise, we’re going to set up the *boundary conditions* for our problem.

To do that, open the *Regions* folder, then expand the *Gas* region.
Here you can see all the boundaries we have:

the *inlet boundaries* – in this case, four inlet faces,
the **outlet boundary**,
and the *wall boundary* for the gas region.

---

Setting the Gas Inlet Boundary

First, I’ll configure the **inlet**.

By default, its *Type* is set to **Wall**.
I’ll change the boundary type from *Wall* to **Velocity Inlet**.

Once the type is set to *Velocity Inlet**, I can define the physical values in the **Physics Values* tab.

The *inlet temperature* is set to **500 K**.
The *inlet velocity* is set to **10 m/s**.

I’ll leave the other parameters as they are and close this panel.

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Setting the Gas Outlet Boundary

Next, I’ll configure the **outlet boundary**.

I change its *Type* from the default to **Pressure Outlet**.

Then, under *Physics Values**, we have the **Static Temperature* field.
This value represents the *temperature of any backflow* that might enter the domain from the outlet.
So if there is any *reverse flow* at the outlet, STAR-CCM+ will use this temperature for that incoming fluid.

I’ll set this *backflow static temperature* to **360 K**.

The *pressure* is left at its default value of *0* (gauge).
We don’t need to change that here.

---

Checking the Gas–Manifold Thermal Boundary

If you click on the *Gas–Manifold Thermal* boundary inside the *Gas* region, you’ll see that its type is already **Mapped Contact Boundary**.

That is exactly the type we want, because this is the boundary through which heat is exchanged between the *gas* and the **solid manifold**.


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