convection

Exchange of thermal energy that is proportional to the difference between the surface temperature on the geometry and the temperature of the surroundings.

Newton’s law of cooling states that the rate of heat loss of a body due to convective processes is proportional to the difference in temperatures between the body and its surroundings.

Forced convection occurs when a gas or fluid is in motion due to an external source (for example, a fan).
Free or natural convection occurs when a gas or fluid is in motion due to density variations generated by temperature differences and relative buoyancy. Heavier (more dense) components fall, while lighter (less dense) components rise, leading to bulk movement of the gas or fluid.

In QY CAD Simulation, you can use the Thermal Loads group→Convection command to apply a convection load in a thermal study.

To learn more, see the following help topics: