TMVOC-Temperature is out of range
Hello everyone.
I'm currently learning to use TMVOC, but I've encountered some problems. I've successfully simulated flow under only rainfall conditions, constant head, and isothermal conditions. However, I'm facing some unknown issues when simulating unsteady flow in a non-isothermal region. I'm using pumping wells to simulate unsteady flow.
Below is a description of the process.
I'm using TMVOC to simulate unsteady flow in a region. First, I created a flow model under constant head and isothermal conditions at this site. Then, under isothermal constant head conditions, I further added a certain number of pumping wells to obtain an unsteady flow model under isothermal conditions. Finally, I performed a non-isothermal simulation based on this, but again retained the pumping wells.
However, the situation shown in the image occurred during the simulation. Could you please provide some solutions? I've attached the relevant files.
I would like to express my sincere gratitude once again.
3 replies
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The error messages indicate that the temperature has fallen outside the valid range for calculating the water saturation pressure (which is a function of temperature). If these messages occur only occasionally, they likely reflect a transient non-physical state during Newton iteration, where an intermediate solution produces an artificially low temperature. In such cases, the simulation can usually continue without affecting the final results. However, if the temperature at certain elements truly drops below 0 °C, this may indicate that excessive heat has been extracted from the system.