diff --git a/src/aeros_simulation/service.py b/src/aeros_simulation/service.py
index 2b13bba..04688bf 100644
--- a/src/aeros_simulation/service.py
+++ b/src/aeros_simulation/service.py
@@ -25,6 +25,7 @@ from .model import (
 from src.aeros_equipment.model import AerosEquipment, AerosEquipmentCustomParameterData
 from src.aeros_equipment.schema import EquipmentWithCustomParameters
 from .schema import SimulationInput, SimulationRankingParameters
+from .utils import calculate_eaf
 
 client = httpx.AsyncClient(timeout=300.0)
 active_simulations = {}
@@ -131,15 +132,10 @@ async def get_or_save_node(*, db_session: DbSession, node_data: dict, type: str
     return node
 
 
-async def execute_simulation(
-    *,
-    db_session: DbSession,
-    simulation_id: Optional[UUID] = None,
-    sim_data: dict,
-    is_saved: bool = False,
-    eq_update: dict = {},
-):
+async def execute_simulation(*, db_session: DbSession, simulation_id: Optional[UUID] = None, sim_data: dict, is_saved: bool = False, eq_update: dict = None):
     """Execute the actual simulation call"""
+    if eq_update is None:
+        eq_update = {}
     print("Executing simulation with id: %s", simulation_id, sim_data["SchematicName"])
 
     try:
@@ -177,7 +173,7 @@ async def execute_simulation(
 
         raise HTTPException(
             status_code=status.HTTP_500_INTERNAL_SERVER_ERROR, detail=str(e)
-        )
+        ) from e
 
 
 async def get_all_aeros_node(*, db_session: DbSession, schematic_name: Optional[str] = None):