In ANSYS (especially Fluent), this warning appears when the fluid and solid are not thermally coupled, even though both regions exist in the model. In a proper conjugate heat transfer (CHT) setup, heat should conduct through the solid and then convect into the fluid automatically, but this can only happen if the energy equation is enabled and the fluid–solid interface is defined as a coupled wall. First, make sure the Energy model is turned ON under Models → Energy. Next, check that the solid region has a material assigned with non-zero thermal conductivity and that the fluid also has valid thermal properties. The most critical step is at the fluid–solid interface: in Boundary Conditions, the interface walls on both the fluid and solid sides must have their thermal condition set to “Coupled”. You should not apply a fixed temperature or heat flux at this interface; Fluent must calculate the interface temperature on its own. Any prescribed temperature or adiabatic condition at the interface will block heat transfer and trigger this warning. Apply temperature or heat flux only on the outer surface of the solid and temperature at the fluid inlet, not at the interface. Finally, ensure that the fluid and solid meshes are actually in contact (shared topology or a proper interface). Once the energy equation is active, materials are correctly defined, and the interface is set to “Coupled,” the warning will disappear and true conjugate heat transfer will occur.
no connection fluid and solid region for heat transfer
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Hello, I hope you're doing well. I want to perform a CHT (Conjugate Heat Transfer) analysis. I've defined the solid and liquid regions. I've entered the inlet and outlet conditions and surface temperatures. However, I'm receiving the following warning. How can I fix this? Heat transfer cannot occur between the fluid and the solid with a hot surface.
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I managed to send the warning using the Prepare-imprint command. However, heat transfer is still not occurring.
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I defined a local mesh between the fluid and solid surfaces. It had some effect; the heat transfer increased slightly. However, even with an RTX 5090 graphics card, I wasn't allowed to go down to very small values. I received a "GPU memory exceed..." warning. I realized it couldn't solve the problem because the geometry was too small. It seems like continuing with Fluent would be a better option.
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I tried to solve it using Refine. However, this time it gave this error because of the surface I was imprinting on. After editing in the "extra Edges" section, the "solve" option became active. But when I solved it, I got the errors shown in the last image.
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