Pressure drop calibration using thermal liquid blocks (1D vs CFD)

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Hello Dear,
I'm writing this to seek your help and technical advice.
I'm performing pressure drop correlation study 1D TL model with CFD data.
At negative temperature i.e. -40 1D model over estimating for both over-prediction and under prediction for a range of flow rates.
What could be a reason? What factors I can use to calibrate 1D model and their typical values?
Any technical advice for calibration will be really helpful to me.
NOTE: Properties are very well aligned with properties used in CFD.
  6 Comments
Jakub
Jakub on 2 Oct 2025 at 8:55
Hi Gaurav,
Can you tell something more about your calibration tools?
I guess that the Simulink Design Optimization is a right tool to help you. You may see the get started tutorial from the documentation page:
It shows the full workflow starting from Data Preprocessing (it plays the important role in calibration, if you have not-cleaned data you cannot expect to get the right parameters set).
If you get stuck in the local minimum, you may choose the global algorithm like pattern search.
First, try to go through the tutorial and, if it is possible cosider to share with us your model.
Best,
Jakub Szyman

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