VDB and Water surface issue

Development World Creation
1

Hi,
I’m facing two issues.

  1. When I put VDB fire/smoke intersecting another object, some steps appear between the VDB and the object.

    problem_uE
    problem_uE986×640 592 KB

  2. VDB smoke/ fire doesn’t get visible on the water surface.

    problem_uE-2
    problem_uE-2916×672 93.3 KB

I don’t know what is called this issue and even don’t know how to get out of this issue. Please help me to solve this.