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The pressure drop you see is most likely because that region has a different initial density (lower) than the reference density. When the equation of state is evaluated in the first cycle it immediately gets a negative pressure. This could happen if you fill the Euler cells with a density different from the reference density. It can also happen if you change the reference density after filling the part without going back and refilling. Please examine the initial density in this region at cycle zero, it probably will not be equal to the reference density. However, you might not be able to see enough significant digits in the Examine window. So, simply refill the entire region again with the reference density.
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