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Given the water density isn't changing, try using a velocity inlet as it's generally more stable. Pressure outlet is correct, and 0 Pa is fine as a value as you're running single phase: check the outlet backflow temperature. If you're seeing excessive diffusivity, check the fluid you have in the cell zone(s) as you won't be the first (nor the last) to accidentally set up water correctly and then run the model with air.... What temperature did you initialise the tank to?
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