diff --git a/external/walberla b/external/walberla
new file mode 160000
index 0000000000000000000000000000000000000000..65fcc780c8843f982b23e3b1f14de6408982c5d8
--- /dev/null
+++ b/external/walberla
@@ -0,0 +1 @@
+Subproject commit 65fcc780c8843f982b23e3b1f14de6408982c5d8