diff --git a/src/one-body-sample.py b/src/one-body-sample.py
index b44987fb5e0e858768ed8d8eb1abb701ac4ab244..04a1799aa0acecf0ad1b5f37d471364c814a513f 100644
--- a/src/one-body-sample.py
+++ b/src/one-body-sample.py
@@ -4,7 +4,11 @@ class neumannCondition:
 
 class velocityDirichletCondition:
     def __call__(self, relativeTime):
-        return 2e-4
+        if relativeTime <= 0.25:
+            factor = 4*relativeTime;
+        else:
+            factor = 1
+        return 2e-4 * factor
 
 Functions = {
     'neumannCondition' : neumannCondition(),