Hello everyone,
I have recently conducted simulations in Abaqus 2022 Explicit regarding convective heat transfer between a liquid and a metal plate. The method I selected for this simulation in the step is Dynamic, Temperature-Displacement, Explicit. Heat transfer occurs on one surface of the plate, which is penetrated by a liquid jet. Heat transfer should take place in the contact area between the liquid and the solid. To achieve this, I implemented a Python function that detects the contact area between the liquid and the solid using the C_PRESS data on the nodes of the contact surface of the metal plate. The resulting area was taken as an analytical field (a mapped field with a field value of 1 at each node), which is used in the film condition to implement the heat transfer coefficient for the new restart job.
For the initial conditions, I set the contact time of the water to 0.0016 seconds (with a water jet impingement speed of 6.358 m/s and a distance of 10 mm between the plate and the nozzle). The step time for both the analysis and the restart job is set at 0.2 seconds, so the water comes into contact with the plate when the analysis job is completed.
My issue is that, although the C-PRESS data indicates that the water jet successfully contacted the plate and spread on the surface of the plate, the models shown in the ODB data only display the water jet, the water spread on the surface cannot be found (similar to what Picture 1 shows). Is this normal for this type of simulation, and if I want it to display the water on the plate, what adjustments should I make in the settings?
Another question is that I've seen in the literature that, in order to simulate the physical change of water, one needs to set the property → Equation of State → Us-Up. The recommended setting I received is C0 at 1450000 mm/s, and the other two parameters, 's' and 'Gamma0', are both set to 0. I experimented with giving C0 a much smaller value, such as 1 mm/s or 1450 mm/s, which significantly reduced the time required for the simulation. However, it also caused considerable variation in the results of the heat transfer analysis (as shown in Picture 2). I would really like to know how this setting (EoS-Us-Up) affects the analysis of temperature results and why it also changes the simulation speed. I would greatly appreciate it if you could answer my questions.
