From 1037aa4db980c8d61bb3df53675abf82d7fd49f8 Mon Sep 17 00:00:00 2001
From: rstiskalek <richard.stiskalek@protonmail.com>
Date: Fri, 18 Nov 2022 10:53:06 +0000
Subject: [PATCH] add velocity conversion

---
 csiborgtools/units/box_units.py | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/csiborgtools/units/box_units.py b/csiborgtools/units/box_units.py
index a3c4bc9..4adcd31 100644
--- a/csiborgtools/units/box_units.py
+++ b/csiborgtools/units/box_units.py
@@ -199,6 +199,22 @@ class BoxUnits:
         """
         return self.box2kpc(length) * 1e-3
 
+    def box2vel(self, vel):
+        r"""
+        Convert velocity from box units to :math:`\mathrm{m} / \mathrm{s}^2`.
+
+        Parameters
+        ----------
+        vel : float
+            Velocity in box units.
+
+        Returns
+        -------
+        vel : float
+            Velocity in :math:`\mathrm{m} / \mathrm{s}^2`
+        """
+        return vel * (1e-2 * self._unit_l / self._unit_t / self.aexp)
+
     def box2cosmoredshift(self, length):
         r"""
         Convert the box comoving distance to cosmological redshift.