Convergent Plot in input and output unstable


I am investigating the characteristics of multiple designs for a shell and tube Heat exchanger. I am initially running this program with a single-pipe configuration. However, looking at the convergence plot for the inlet and outlet are unstable. Please could you give me some feedback on why this could be?

Please see the below link to the project

Thank you for your time

Hi there,
Thank you for posting on the forum.
We will take a look and get back to you soon :slight_smile:

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Updated Single Pipe Configuration

Design was changed due to calculation of heat exchanger through use of LMTD method for crossflow.

I am expecting a temperature Oil outlet of 70 Degrees C and a temperature of water outlet of 20 Degrees C.
on Run 6 however, I am seeing barely any change in temperature and the inlet and outlet convergence plot is not stabilising. could you please provide feedback on what i could do to help gain a convergence within the inlet and outlet plots? Thank you