Simcenter Flotherm Spikes in Residuals/Monitors when restarting a solution without any changes

2024-09-30T19:55:09.000-0400
Flotherm

Summary

We notice jumps in the solution residual(especially Potential when using Joule Heating) and sometimes monitor points as well when we try to restart a solution from the last stopped iteration. Why does this happen? Does it impact solution accuracy?


Details

One of the main reasons for this behavior is that the results fields are always written as single precision (even when the double precision solver is used). Rounding errors can occur when the solve is continued and this can occasionally cause a noticeable jump in residuals.  But, the accuracy of the converged results is not compromised. Please try to do a mass-energy balance calculation or use the known data points to monitor for steady monitor points and use your engineering judgement to conclude whether the results are reliable.

KB Article ID# KB000153809_EN_US

Contents

SummaryDetails

Associated Components

Simcenter Flotherm