Detect collider collision ,identify and access colliding colliders

Hey, I'm making an explosion in a game and for the heat wave, I made a sphere with a collider that grows progressively. Now I want to access all the colliders that are colliding with the collider of the sphere of the heat wave. How do it do that ?

The script of the dimension :

 float expansionRate = 10 * Times.deltaTime;
 float diameter = 350 * expansionRate;
 //It is supposed to grow 350 meters every 1/10 of a second, so 3500 meters every second.
 
 Vetor3 dimension = new Vector3(diameter, diameter, diameter)
 heatWaveSphere.transform.localScale = dimension;
 
 Collider[] AffectedColliders = Physics.OverlapSphere(transform.position, diameter);

PS : I tried using an OverlapSphere, and it works to get the colliders, but for some reason that I ignore, it grows much faster that the sphere, while having the same parameters