try to fix bug

Author: zhangzhanqun

src/ansys/dyna/core/pre/dynadem.py

@@ -118,6 +118,7 @@ class DEMAnalysis(BaseObj):
     def __init__(self):
         self.defined_des = False
         self.stub = DynaBase.get_stub()
+        self.type = "analysis_dem"
 
     def set_des(
         self,

src/ansys/dyna/core/pre/dynaicfd.py

@@ -750,6 +750,7 @@ def __init__(self, surfaces):
         self.embeded_surf = []
         self.meshsize_surf = []
         self.fluid_interfaces = []
+        self.type = "meshedvolume"
 
     def embed_shell(self, embeded):
         """Define surfaces that the mesher is to embed inside the volume mesh.