I know that for this model, the gas should collect at the very top, where in reality there is a vertical tube that collects the gas. During operation the internal pressure builds with the build up of gas, so the liquid level can vary, meaning that this simulation with a collection of gas at the top is not too dissimilar from reality. I did include a degassing boundary (where the vertical tube joins the model) initially, but was removed during this troubleshooting. The reason for this model is to check if the gas manages to find its way into the 'plughole' where it should not go.
I know from my attempts previously, that the models within multiphase can make it very difficult to achieve a good result. In the past I excluded the additional optional models, such as the virtual mass and others in the options, as it was the only way it would run. But to get realistic results, I know I need them.
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