I am doing a radiator heat transfer problem using fluent. The temperature range of the zones is 323 - 300 K. But no matter what settings and mesh quality I use, results are in the range of 500- 200 K range. Every help is highly appreciated.
I suppose you are referring to an automotive radiator. The highest temperature (the jacket water from the engine) cannot be higher than 373 K. Similarly the coolant will be at ambient temperature. In your case check how these unrealistic temperatures of 500 K and 200 K are being generated. Clearly something is going very wrong because the basics of thermodynamics are violated.
If it is an automotive radiator, the range of temperature for cooling of water will typically be from around 368 K to 361 K (95 C to 88 C). If air enters at 303 K (30 C), then make sure to keep its exit temperature to below 333 K (60 C).
I think there is a problem of sign some where, thus instead of extracting heat your are producing it.
Can you explain your inlet and outlet condition with respect to your domain. Or provide a detailed discussion of your physical model. Other than meshing, you can suspect boundary conditions.
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