lanl/singularity-eos

Address warnings in analytic tests from the Mie Gruneisen Us-up EOS

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#565 opened on Sep 17, 2025

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Testingbuggood first issue

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Description

When running eos_analytic_unit_tests, a lot of warnings related to the Mie-Gruneisen Us-up appear regarding negative temperature and negative entropy. Actually, the negative entropy doesn't matter because the EOS doesn't satisfy the third law of thermodynamics. In particular, $T \to 0$ corresponds to $S \to -\infty$. But the negative temperature is something that should be addressed.

Contributor guide

Research direction
Look at the analytic unit tests for Mie Gruneisen Us up EOS and identify where negative temperatures occur. Trace the computation of temperature from the EOS implementation and fix the physical inconsistency.
Tech stack
cpp
Domain
backend
Issue type
Bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
GitC++
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
70