Why can't ansys water cooling simulation establish openings by selecting surfaces?

The Boolean operation ability of ansys is weak. If you do it in ansys, first try to chamfer the line, and then form the chamfer surface from the chamfer line. According to the relevant information inquired, the simulation of the water cooling plate by ansys shows that there is an S-shaped water cooling channel inside the aluminum plate, the inlet temperature is 20℃(293. 15K), and the heating power on the upper surface of the aluminum plate is 5000W/m2. By simulating the temperature distribution on the surface of aluminum plate, in the plate and in the flow channel under different water flow rates.