Abstract: The temperature field, smoke concentration field and wind velocity field of fire in Notre Dame fire in Paris was simulated by Simtec. The result of the simulation showed that there are obvious temperature zones inside the spire. The temperature in the spire is lower and the temperature in the middle of the spire is higher. The temperature above the fire source reached 900 ℃ quickly, and then fluctuated up and down at 900~1 000 ℃. The temperature in the middle of the spire fluctuated at 560~720 ℃ . The temperature of the cross roof rose slowly. The movement of fire smoke is to fill the whole spire at first, and then gradually spread to the whole cross roof. Due to the chimney effect, the air velocity in the middle of the spire is relatively large, forming a high speed area about 15 m long, while the air velocity at the top and bottom of the tower is lower.

Key words: Notre Dame de Paris, fire, temperature, smoke, air velocity