CMS EOS

[mutluyildiz1]

Hi,

We construct planetary interior mıodels using the MESA versions v7184 and r22.05.1.

In place of SCvH EOS, we try to use CMS EOS. Unfortunately, we could not properly run the
code yet. We follow three steps in the mesa/eos/eosCMS_builder/README file of r22.05.1.
I guess there is no problem with the first two steps, but build_data script does not produce
the required data files in eosCMS_builder/data/eosCMS_data

We would be very grateful if you could help us construct models with CMS EOS.

Best regards,
Mutlu

[evbauer]

Thanks for the report! Unfortunately the documentation states that CMS is currently in an "experimental" status in terms of its implementation in MESA: https://docs.mesastar.org/en/release-r24.03.1/eos/overview.html#cms

My recollection is that we were struggling with some thermodynamic consistency issues when we were working on implementing and testing it, but I don't recall the specific details. @sunnywong314 might be able to offer some more insight into that.

So right now CMS is not fully supported, but if you'd like to post more details about your problems or suggestions for improvements here, we might be able to use this as an opportunity to work on improvements.

[fxt44]

i downloaded and built the new public release mesa-r24.03.1. when mesa builds it unpacks precomputed cms eos tables into $MESADIR/data/eosCMS_data . so it is not necessary to explicitly use the codes or script in $MESA_DIR/eos/eosCMS_builder . these codes and/or script in this directory may need tweaking to run properly because, picking up on evan's comment, we looked at implementing the cms eos in mesa in mid-2020 and again in mid-2021. it never made into a public version of mesa due to blending issues and thermodynamic inconsistencies. it remains an experimental effort that is not yet ready for prime time science usage https://docs.mesastar.org/en/release-r24.03.1/eos/overview.html#cms .

[mutluyildiz1]

Thanks for the comments. I wonder if any updated EOS is available for the planetary interior models. For example, EOS of Potekhin & Chabrier 2010...