How would the tides on earth and being different is the moon revolve around Earth in 15 days instead of 30 days

Well, first of all, the moon revolves around Earth in 27.3 days,

not 30.

Right now, there are four tides ... high, low, high, low ... in roughly

24 hours and 50 minutes. The very rough average is 6 hours and

12 minutes from one extreme tide to the next extreme.

If the moon's period of revolution became only half as long as it

is now, then there would be four tides in roughly 25 hours and

38 minutes ... the very rough average would be 6 hours and

24 minutes between the extremes.

Also ... if the moon's orbital period were only half of what it is

now, that would mean that the moon would have to be much

closer to Earth than it is now. So high tides would be higher,

and low tides would be lower

.