Dear professor, I'm really grateful for your advices. I hace try piecewise-linear and get a much more reasonable simulation compared to polynomial. Unfortunately, I found that we can only enter 49 points to describe the fitting curve as shown below. If the temperature of fluid in domain ranging in a larger extents, it couldn't satisfy desired accuracy compared with polynomial. Meanwhile, we need to take care when using polynomial because of rounding errors. I want to know Fluent support more points inputs to cover a larger range so that we can a higher precision using some methods like TUI?
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