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<p>Dear Flash users,</p>
<p>As I have observed some consequent differences between the
results of my FLASH simulations between 4.7.1 and 4.8, I am
looking at variations of my case. However, I met an issue with the
4.8 version that I don´t observe with the 4.7.1 version.<br>
<br>
The case are identical, they do have the exact same flash.par,
Simulation_adjustEvolution.F90, Simulation_customizeProlong.F90,
Simulation_data.F90, Simulation_init.F90 and
Simulation_initBlock.F90.<br>
<br>
In the 4.8 run, I do get very quickly a message error:<br>
<br>
<b>abort_message: [Eos] Error: too many iterations in
Newton-Raphson</b><br>
<br>
which is due to negative dE/dt detected.<br>
<br>
I tried to set irenorm =1 and to increase eos_max Newton and
eos_tolerance as seen on the archived thread
(<a class="moz-txt-link-freetext" href="https://flash.rochester.edu/pipermail/flash-users/2022-November/008229.html">https://flash.rochester.edu/pipermail/flash-users/2022-November/008229.html</a>)<br>
<br>
If one of you has an idea of the change made between versions that
would cause that and/or have a fix for the Newton-Raphson issue, I
would be very interested<br>
<br>
I here joined the .par file and the log files for both 4.8 and
4.7.1<br>
<br>
Thank you in advance for your help.<br>
<br>
Best regards<br>
</p>
<pre class="moz-signature" cols="72">--
Dr. Arthur Hirsch-Passicos
Post-doctoral Researcher
Laser Particle Acceleration Division
Institute of Radiation Physics
Helmholtz-Zentrum Dresden-Rossendorf e.V.</pre>
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