For off designs, create different reports folders for each design run

aviary/interface/methods_for_level2.py

@@ -7,6 +7,7 @@
 from datetime import datetime
 from enum import Enum
 from pathlib import Path
+from itertools import count
 
 import dymos as dm
 import numpy as np
@@ -1366,7 +1367,14 @@ def run_off_design_mission(
             )
 
         if name is None:
-            name = name = self._name + '_off_design'
+            # increment the name if the output directory already exists
+            #    to avoid overwriting previous off-design runs
+            base_name = self._name + '_off_design'
+            for design_number in count(0):
+                name = base_name if design_number == 0 else f'{base_name}_{design_number}'
+                output_path = Path(f'{name}_out')
+                if not output_path.is_dir():
+                    break
         off_design_prob = AviaryProblem(name=name)
 
         # Set up problem for mission, such as equations of motion, configurators, etc.

aviary/interface/test/test_reports.py

@@ -13,6 +13,7 @@
 from aviary.subsystems.subsystem_builder import SubsystemBuilder
 from aviary.utils.develop_metadata import add_meta_data
 from aviary.variable_info.variable_meta_data import CoreMetaData
+import aviary.api as av
 
 
 @use_tempdirs
@@ -135,6 +136,24 @@ def build_pre_mission(self, aviary_inputs):
         # no need to run this model, just generate the report.
         prob.final_setup()
 
+    @set_env_vars(TESTFLO_RUNNING='0')
+    def test_multiple_off_design_report_directories(self):
+        prob = av.AviaryProblem(verbosity=0)
+        prob.load_inputs(
+            'models/aircraft/advanced_single_aisle/advanced_single_aisle_FLOPS.csv', phase_info
+        )
+        prob.check_and_preprocess_inputs()
+        prob.build_model()
+        prob.add_driver('SLSQP', max_iter=50)
+        prob.add_design_variables()
+        prob.add_objective()
+        prob.setup()
+        prob.run_aviary_problem()
+        prob.run_off_design_mission(problem_type='fallout', mission_gross_mass=115000)
+        prob.run_off_design_mission(problem_type='alternate', mission_range=1250)
+        assert Path('testflo_off_design_1_out').is_dir()
+        assert Path('testflo_off_design_out').is_dir()
+
 
 if __name__ == '__main__':
     unittest.main()