Hello, I suggest you try with a low TSSFAC value, such TSSFAC=0.5 or lower, on CONTROL_TIMESTEP in case this behavior is due to an instability. Also make sure the coefficients in the *EOS_001 card are in the correct pressure units. The initial relative volume V0 is usually set to 1.0 or to 0.0, which defaults to 1.0.
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