[Problem] Dirichlet: Increase linearly at first

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(),