# WALL

Section can be repeated.

Controls the activation of walls on COLVAR during a metadynamic run. [Edit on GitHub]

Subsections

- GAUSSIAN
- QUADRATIC
- QUARTIC
- REFLECTIVE

## Keywords

- POSITION

- TYPE

## Keyword descriptions

POSITION: real = [internal_cp2k]

  Usage: POSITION <REAL>

  Specify the value of the colvar for the wall position [Edit on GitHub]

TYPE: enum = NONE

  Usage: TYPE (REFLECTIVE|QUADRATIC|QUARTIC|GAUSSIAN|NONE)

  Valid values:

  - `REFLECTIVE` Reflective wall. Colvar velocity is inverted when the colvar is beyond the wall position.

  - `QUADRATIC` Applies a quadratic potential at the wall position.

  - `QUARTIC` Applies a quartic potential at the wall position.

  - `GAUSSIAN` Applies a gaussian potential at the wall position.

  - `NONE` No walls are applied.

  Specify the type of wall [Edit on GitHub]