Running: ./testmodel.py --libraries=/home/hudson/saved_omc/libraries/.openmodelica/libraries/ --ompython_omhome=/usr ModelicaTest_3.2.1_ModelicaTest.Fluid.Dissipation.Verifications.PressureLoss.StraightPipe.dp_twoPhaseOverall_DP.conf.json loadFile("/home/hudson/saved_omc/libraries/.openmodelica/libraries/ModelicaServices 4.0.0+maint.om/package.mo", uses=false) loadFile("/home/hudson/saved_omc/libraries/.openmodelica/libraries/Complex 4.0.0+maint.om/package.mo", uses=false) loadFile("/home/hudson/saved_omc/libraries/.openmodelica/libraries/Modelica 3.2.3+maint.om/package.mo", uses=false) loadFile("/home/hudson/saved_omc/libraries/.openmodelica/libraries/ModelicaTest 3.2.1+maint.om/package.mo", uses=false) Using package ModelicaTest with version 3.2.1 (/home/hudson/saved_omc/libraries/.openmodelica/libraries/ModelicaTest 3.2.1+maint.om/package.mo) Using package Modelica with version 3.2.3 (/home/hudson/saved_omc/libraries/.openmodelica/libraries/Modelica 3.2.3+maint.om/package.mo) Using package Complex with version 4.0.0 (/home/hudson/saved_omc/libraries/.openmodelica/libraries/Complex 4.0.0+maint.om/package.mo) Using package ModelicaServices with version 4.0.0 (/home/hudson/saved_omc/libraries/.openmodelica/libraries/ModelicaServices 4.0.0+maint.om/package.mo) Running command: translateModel(ModelicaTest.Fluid.Dissipation.Verifications.PressureLoss.StraightPipe.dp_twoPhaseOverall_DP,tolerance=1e-05,outputFormat="empty",numberOfIntervals=10100,variableFilter="",fileNamePrefix="ModelicaTest_3.2.1_ModelicaTest.Fluid.Dissipation.Verifications.PressureLoss.StraightPipe.dp_twoPhaseOverall_DP") translateModel(ModelicaTest.Fluid.Dissipation.Verifications.PressureLoss.StraightPipe.dp_twoPhaseOverall_DP,tolerance=1e-05,outputFormat="empty",numberOfIntervals=10100,variableFilter="",fileNamePrefix="ModelicaTest_3.2.1_ModelicaTest.Fluid.Dissipation.Verifications.PressureLoss.StraightPipe.dp_twoPhaseOverall_DP") Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/ModelicaServices 4.0.0+maint.om/package.mo): time 0.0007704/0.0007702, allocations: 84.38 kB / 15.06 MB, free: 1.09 MB / 14.72 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Complex 4.0.0+maint.om/package.mo): time 0.0007763/0.0007762, allocations: 168.7 kB / 15.95 MB, free: 204 kB / 14.72 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Modelica 3.2.3+maint.om/package.mo): time 1.431/1.431, allocations: 205.4 MB / 222.1 MB, free: 5.637 MB / 174.1 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/ModelicaTest 3.2.1+maint.om/package.mo): time 0.3412/0.3412, allocations: 38.04 MB / 308.4 MB, free: 10.45 MB / 254.1 MB Notification: Modelica requested package Complex of version 3.2.3. Complex 4.0.0 is used instead which states that it is fully compatible without conversion script needed. Notification: Modelica requested package ModelicaServices of version 3.2.3. ModelicaServices 4.0.0 is used instead which states that it is fully compatible without conversion script needed. Notification: ModelicaTest requested package Modelica of version 3.2.1. Modelica 3.2.3 is used instead which states that it is fully compatible without conversion script needed. Notification: Performance of FrontEnd - loaded program: time 0.0006238/0.0006241, allocations: 20 kB / 376.5 MB, free: 15.12 MB / 318.1 MB Notification: Performance of FrontEnd - Absyn->SCode: time 0.1371/0.1378, allocations: 57.52 MB / 434 MB, free: 5.508 MB / 366.1 MB Notification: Performance of NFInst.instantiate(ModelicaTest.Fluid.Dissipation.Verifications.PressureLoss.StraightPipe.dp_twoPhaseOverall_DP): time 0.002712/0.1405, allocations: 1.895 MB / 435.9 MB, free: 3.598 MB / 366.1 MB Notification: Performance of NFInst.instExpressions: time 0.007622/0.1482, allocations: 5.091 MB / 441 MB, free: 14.49 MB / 382.1 MB Notification: Performance of NFInst.updateImplicitVariability: time 0.0003154/0.1485, allocations: 0 / 441 MB, free: 14.49 MB / 382.1 MB Notification: Performance of NFTyping.typeComponents: time 0.0004942/0.1491, allocations: 79.52 kB / 441.1 MB, free: 14.41 MB / 382.1 MB Notification: Performance of NFTyping.typeBindings: time 0.0004125/0.1495, allocations: 103.3 kB / 441.2 MB, free: 14.31 MB / 382.1 MB Notification: Performance of NFTyping.typeClassSections: time 0.004651/0.1542, allocations: 1.351 MB / 442.5 MB, free: 12.96 MB / 382.1 MB Notification: Performance of NFFlatten.flatten: time 0.0009101/0.1551, allocations: 0.8592 MB / 443.4 MB, free: 12.09 MB / 382.1 MB Notification: Performance of NFFlatten.resolveConnections: time 0.0002238/0.1553, allocations: 142 kB / 443.5 MB, free: 11.94 MB / 382.1 MB Notification: Performance of NFEvalConstants.evaluate: time 0.0004921/0.1558, allocations: 298.5 kB / 443.8 MB, free: 11.65 MB / 382.1 MB Notification: Performance of NFSimplifyModel.simplify: time 0.0005509/0.1564, allocations: 406.1 kB / 444.2 MB, free: 11.25 MB / 382.1 MB Notification: Performance of NFPackage.collectConstants: time 0.0001376/0.1565, allocations: 24 kB / 444.2 MB, free: 11.23 MB / 382.1 MB Notification: Performance of NFFlatten.collectFunctions: time 0.004126/0.1607, allocations: 2.744 MB / 447 MB, free: 8.477 MB / 382.1 MB Notification: Performance of NFScalarize.scalarize: time 0.0002453/0.1609, allocations: 171.1 kB / 447.1 MB, free: 8.309 MB / 382.1 MB Notification: Performance of NFVerifyModel.verify: time 0.0002343/0.1612, allocations: 157.2 kB / 447.3 MB, free: 8.148 MB / 382.1 MB Notification: Performance of NFConvertDAE.convert: time 0.002309/0.1635, allocations: 1.43 MB / 448.7 MB, free: 6.715 MB / 382.1 MB Notification: Performance of FrontEnd - DAE generated: time 4.098e-06/0.1635, allocations: 4 kB / 448.7 MB, free: 6.711 MB / 382.1 MB Notification: Performance of FrontEnd: time 2.265e-06/0.1635, allocations: 0 / 448.7 MB, free: 6.711 MB / 382.1 MB Notification: Performance of Transformations before backend: time 3.937e-05/0.1636, allocations: 0 / 448.7 MB, free: 6.711 MB / 382.1 MB Notification: Model statistics after passing the front-end and creating the data structures used by the back-end: * Number of equations: 250 * Number of variables: 250 Notification: Performance of Generate backend data structure: time 0.004151/0.1677, allocations: 1.61 MB / 450.3 MB, free: 5.047 MB / 382.1 MB Notification: Performance of prepare preOptimizeDAE: time 5.88e-05/0.1678, allocations: 12.03 kB / 450.3 MB, free: 5.035 MB / 382.1 MB Notification: Performance of preOpt normalInlineFunction (simulation): time 0.0003917/0.1682, allocations: 98.69 kB / 450.4 MB, free: 4.938 MB / 382.1 MB Notification: Performance of preOpt evaluateParameters (simulation): time 0.0009622/0.1692, allocations: 464.5 kB / 450.9 MB, free: 4.441 MB / 382.1 MB Notification: Performance of preOpt simplifyIfEquations (simulation): time 7.195e-05/0.1692, allocations: 58 kB / 450.9 MB, free: 4.387 MB / 382.1 MB Notification: Performance of preOpt expandDerOperator (simulation): time 0.0002026/0.1694, allocations: 79.98 kB / 451 MB, free: 4.309 MB / 382.1 MB Notification: Performance of preOpt clockPartitioning (simulation): time 0.003141/0.1726, allocations: 1.728 MB / 452.7 MB, free: 2.516 MB / 382.1 MB Notification: Performance of preOpt findStateOrder (simulation): time 2.048e-05/0.1726, allocations: 0 / 452.7 MB, free: 2.516 MB / 382.1 MB Notification: Performance of preOpt replaceEdgeChange (simulation): time 7.507e-05/0.1727, allocations: 35.95 kB / 452.8 MB, free: 2.48 MB / 382.1 MB Notification: Performance of preOpt inlineArrayEqn (simulation): time 9.067e-05/0.1728, allocations: 81.95 kB / 452.9 MB, free: 2.402 MB / 382.1 MB Notification: Performance of preOpt removeEqualRHS (simulation): time 0.003553/0.1764, allocations: 1.971 MB / 454.8 MB, free: 440 kB / 382.1 MB Notification: Performance of preOpt removeSimpleEquations (simulation): time 0.2657/0.4421, allocations: 3.746 MB / 458.6 MB, free: 48.05 MB / 382.1 MB Notification: Performance of preOpt comSubExp (simulation): time 0.001479/0.4436, allocations: 1.055 MB / 459.6 MB, free: 47.61 MB / 382.1 MB Notification: Performance of preOpt resolveLoops (simulation): time 0.001154/0.4448, allocations: 0.6549 MB / 460.3 MB, free: 47.46 MB / 382.1 MB Notification: Performance of preOpt evalFunc (simulation): time 7.425e-05/0.4449, allocations: 15 kB / 460.3 MB, free: 47.46 MB / 382.1 MB Notification: Performance of preOpt encapsulateWhenConditions (simulation): time 4.007e-05/0.445, allocations: 63.7 kB / 460.4 MB, free: 47.41 MB / 382.1 MB Notification: Performance of pre-optimization done (n=38): time 3.556e-06/0.445, allocations: 0 / 460.4 MB, free: 47.41 MB / 382.1 MB Notification: Performance of matching and sorting (n=38): time 0.003807/0.4488, allocations: 1.803 MB / 462.2 MB, free: 47.26 MB / 382.1 MB Notification: Performance of inlineWhenForInitialization (initialization): time 0.0001449/0.4489, allocations: 0.4981 MB / 462.7 MB, free: 46.66 MB / 382.1 MB Notification: Performance of selectInitializationVariablesDAE (initialization): time 0.0008711/0.4498, allocations: 0.8813 MB / 463.5 MB, free: 46.51 MB / 382.1 MB Notification: Performance of collectPreVariables (initialization): time 3.963e-05/0.4499, allocations: 31.58 kB / 463.6 MB, free: 46.48 MB / 382.1 MB Notification: Performance of collectInitialEqns (initialization): time 0.0002976/0.4502, allocations: 0.5296 MB / 464.1 MB, free: 46.18 MB / 382.1 MB Notification: Performance of collectInitialBindings (initialization): time 0.0001191/0.4503, allocations: 151.4 kB / 464.3 MB, free: 46.1 MB / 382.1 MB Notification: Performance of simplifyInitialFunctions (initialization): time 6.118e-05/0.4504, allocations: 26.03 kB / 464.3 MB, free: 46.1 MB / 382.1 MB Notification: Performance of setup shared object (initialization): time 0.0001453/0.4505, allocations: 394.2 kB / 464.7 MB, free: 45.79 MB / 382.1 MB Notification: Performance of preBalanceInitialSystem (initialization): time 0.001262/0.4518, allocations: 0.6772 MB / 465.3 MB, free: 45.77 MB / 382.1 MB Notification: Performance of partitionIndependentBlocks (initialization): time 0.001677/0.4535, allocations: 1.345 MB / 466.7 MB, free: 44.87 MB / 382.1 MB Notification: Performance of analyzeInitialSystem (initialization): time 0.001615/0.4551, allocations: 0.8167 MB / 467.5 MB, free: 44.8 MB / 382.1 MB Notification: Performance of solveInitialSystemEqSystem (initialization): time 1.394e-05/0.4551, allocations: 6.781 kB / 467.5 MB, free: 44.8 MB / 382.1 MB Notification: Performance of matching and sorting (n=134) (initialization): time 0.00384/0.459, allocations: 1.993 MB / 469.5 MB, free: 44.54 MB / 382.1 MB Notification: Performance of prepare postOptimizeDAE: time 3.435e-05/0.459, allocations: 16.12 kB / 469.5 MB, free: 44.54 MB / 382.1 MB Notification: Performance of postOpt simplifyComplexFunction (initialization): time 2.554e-05/0.4591, allocations: 25.34 kB / 469.5 MB, free: 44.54 MB / 382.1 MB Notification: Performance of postOpt tearingSystem (initialization): time 4.398e-05/0.4591, allocations: 38.55 kB / 469.6 MB, free: 44.54 MB / 382.1 MB Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.001031/0.4601, allocations: 354 kB / 469.9 MB, free: 44.51 MB / 382.1 MB Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 4.042e-05/0.4602, allocations: 54.27 kB / 470 MB, free: 44.5 MB / 382.1 MB Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.001165/0.4614, allocations: 300 kB / 470.3 MB, free: 44.41 MB / 382.1 MB Notification: Performance of postOpt collapseArrayExpressions (initialization): time 0.0001032/0.4615, allocations: 78.47 kB / 470.4 MB, free: 44.41 MB / 382.1 MB Notification: Model statistics after passing the back-end for initialization: * Number of independent subsystems: 108 * Number of states: 0 () * Number of discrete variables: 50 (IN_con_2[5].geodeticPressureLoss,IN_con_2[5].massFlowRateCorrection,IN_con_2[5].momentumPressureLoss,IN_con_2[5].voidFractionApproach,IN_con_2[5].frictionalPressureLoss,IN_con_2[4].geodeticPressureLoss,IN_con_2[4].massFlowRateCorrection,IN_con_2[4].momentumPressureLoss,IN_con_2[4].voidFractionApproach,IN_con_2[4].frictionalPressureLoss,IN_con_2[3].geodeticPressureLoss,IN_con_2[3].massFlowRateCorrection,IN_con_2[3].momentumPressureLoss,IN_con_2[3].voidFractionApproach,IN_con_2[3].frictionalPressureLoss,IN_con_2[2].geodeticPressureLoss,IN_con_2[2].massFlowRateCorrection,IN_con_2[2].momentumPressureLoss,IN_con_2[2].voidFractionApproach,IN_con_2[2].frictionalPressureLoss,IN_con_2[1].geodeticPressureLoss,IN_con_2[1].massFlowRateCorrection,IN_con_2[1].momentumPressureLoss,IN_con_2[1].voidFractionApproach,IN_con_2[1].frictionalPressureLoss,IN_con_1[5].geodeticPressureLoss,IN_con_1[5].massFlowRateCorrection,IN_con_1[5].momentumPressureLoss,IN_con_1[5].voidFractionApproach,IN_con_1[5].frictionalPressureLoss,IN_con_1[4].geodeticPressureLoss,IN_con_1[4].massFlowRateCorrection,IN_con_1[4].momentumPressureLoss,IN_con_1[4].voidFractionApproach,IN_con_1[4].frictionalPressureLoss,IN_con_1[3].geodeticPressureLoss,IN_con_1[3].massFlowRateCorrection,IN_con_1[3].momentumPressureLoss,IN_con_1[3].voidFractionApproach,IN_con_1[3].frictionalPressureLoss,IN_con_1[2].geodeticPressureLoss,IN_con_1[2].massFlowRateCorrection,IN_con_1[2].momentumPressureLoss,IN_con_1[2].voidFractionApproach,IN_con_1[2].frictionalPressureLoss,IN_con_1[1].geodeticPressureLoss,IN_con_1[1].massFlowRateCorrection,IN_con_1[1].momentumPressureLoss,IN_con_1[1].voidFractionApproach,IN_con_1[1].frictionalPressureLoss) * Number of discrete states: 0 () * Number of clocked states: 0 () * Top-level inputs: 0 Notification: Strong component statistics for initialization (134): * Single equations (assignments): 134 * Array equations: 0 * Algorithm blocks: 0 * Record equations: 0 * When equations: 0 * If-equations: 0 * Equation systems (linear and non-linear blocks): 0 * Torn equation systems: 0 * Mixed (continuous/discrete) equation systems: 0 Notification: Performance of prepare postOptimizeDAE: time 0.0005705/0.4621, allocations: 435.1 kB / 470.8 MB, free: 44.25 MB / 382.1 MB Notification: Performance of postOpt lateInlineFunction (simulation): time 0.0003995/0.4625, allocations: 75.62 kB / 470.8 MB, free: 44.21 MB / 382.1 MB Notification: Performance of postOpt wrapFunctionCalls (simulation): time 0.0009531/0.4634, allocations: 0.5063 MB / 471.4 MB, free: 44.07 MB / 382.1 MB Notification: Performance of postOpt inlineArrayEqn (simulation): time 9.077e-06/0.4634, allocations: 6.938 kB / 471.4 MB, free: 44.07 MB / 382.1 MB Notification: Performance of postOpt constantLinearSystem (simulation): time 1.12e-05/0.4635, allocations: 6.188 kB / 471.4 MB, free: 44.07 MB / 382.1 MB Notification: Performance of postOpt simplifysemiLinear (simulation): time 9.198e-06/0.4635, allocations: 12.94 kB / 471.4 MB, free: 44.06 MB / 382.1 MB Notification: Performance of postOpt removeSimpleEquations (simulation): time 0.001554/0.465, allocations: 0.6908 MB / 472.1 MB, free: 43.73 MB / 382.1 MB Notification: Performance of postOpt simplifyComplexFunction (simulation): time 5.23e-06/0.465, allocations: 7.125 kB / 472.1 MB, free: 43.73 MB / 382.1 MB Notification: Performance of postOpt solveSimpleEquations (simulation): time 0.0007049/0.4658, allocations: 239.4 kB / 472.3 MB, free: 43.71 MB / 382.1 MB Notification: Performance of postOpt tearingSystem (simulation): time 7.294e-06/0.4658, allocations: 5.969 kB / 472.3 MB, free: 43.71 MB / 382.1 MB Notification: Performance of postOpt inputDerivativesUsed (simulation): time 4.475e-05/0.4658, allocations: 27.41 kB / 472.3 MB, free: 43.7 MB / 382.1 MB Notification: Performance of postOpt calculateStrongComponentJacobians (simulation): time 4.979e-06/0.4658, allocations: 3.25 kB / 472.3 MB, free: 43.7 MB / 382.1 MB Notification: Performance of postOpt calculateStateSetsJacobians (simulation): time 6.242e-06/0.4658, allocations: 13.97 kB / 472.4 MB, free: 43.7 MB / 382.1 MB Notification: Performance of postOpt symbolicJacobian (simulation): time 0.002596/0.4684, allocations: 2.591 MB / 475 MB, free: 42.07 MB / 382.1 MB Notification: Performance of postOpt removeConstants (simulation): time 0.0001178/0.4686, allocations: 162.8 kB / 475.1 MB, free: 41.92 MB / 382.1 MB Notification: Performance of postOpt simplifyTimeIndepFuncCalls (simulation): time 9.788e-05/0.4687, allocations: 10.28 kB / 475.1 MB, free: 41.92 MB / 382.1 MB Notification: Performance of postOpt simplifyAllExpressions (simulation): time 0.001129/0.4698, allocations: 161.6 kB / 475.3 MB, free: 41.9 MB / 382.1 MB Notification: Performance of postOpt findZeroCrossings (simulation): time 0.0002618/0.4701, allocations: 138.4 kB / 475.4 MB, free: 41.88 MB / 382.1 MB Notification: Performance of postOpt collapseArrayExpressions (simulation): time 5.019e-05/0.4701, allocations: 27.05 kB / 475.4 MB, free: 41.88 MB / 382.1 MB Notification: Performance of sorting global known variables: time 0.0005713/0.4707, allocations: 0.5627 MB / 476 MB, free: 41.66 MB / 382.1 MB Notification: Performance of sort global known variables: time 1e-07/0.4707, allocations: 4 kB / 476 MB, free: 41.66 MB / 382.1 MB Notification: Performance of remove unused functions: time 0.002307/0.473, allocations: 491.8 kB / 476.5 MB, free: 41.59 MB / 382.1 MB Notification: Model statistics after passing the back-end for simulation: * Number of independent subsystems: 18 * Number of states: 0 () * Number of discrete variables: 0 () * Number of discrete states: 0 () * Number of clocked states: 0 () * Top-level inputs: 0 Notification: Strong component statistics for simulation (38): * Single equations (assignments): 38 * Array equations: 0 * Algorithm blocks: 0 * Record equations: 0 * When equations: 0 * If-equations: 0 * Equation systems (linear and non-linear blocks): 0 * Torn equation systems: 0 * Mixed (continuous/discrete) equation systems: 0 Notification: Performance of Backend phase and start with SimCode phase: time 0.001075/0.4741, allocations: 0.5109 MB / 477 MB, free: 41.44 MB / 382.1 MB Notification: Performance of simCode: created initialization part: time 0.00286/0.477, allocations: 1.501 MB / 478.5 MB, free: 41.15 MB / 382.1 MB Notification: Performance of simCode: created event and clocks part: time 3.146e-06/0.477, allocations: 3.938 kB / 478.5 MB, free: 41.15 MB / 382.1 MB Notification: Performance of simCode: created simulation system equations: time 0.001653/0.4787, allocations: 1.008 MB / 479.5 MB, free: 40.96 MB / 382.1 MB Notification: Performance of simCode: created of all other equations (e.g. parameter, nominal, assert, etc): time 0.001806/0.4805, allocations: 120.5 kB / 479.6 MB, free: 40.91 MB / 382.1 MB Notification: Performance of simCode: created linear, non-linear and system jacobian parts: time 0.002496/0.483, allocations: 1.96 MB / 481.6 MB, free: 39.85 MB / 382.1 MB Notification: Performance of simCode: some other stuff during SimCode phase: time 0.0005434/0.4836, allocations: 1.12 MB / 482.7 MB, free: 39.11 MB / 382.1 MB Notification: Performance of simCode: alias equations: time 0.00108/0.4846, allocations: 439.7 kB / 483.1 MB, free: 39.03 MB / 382.1 MB Notification: Performance of simCode: all other stuff during SimCode phase: time 0.0002311/0.4849, allocations: 74.16 kB / 483.2 MB, free: 39.02 MB / 382.1 MB Notification: Performance of SimCode: time 8.82e-07/0.4849, allocations: 0 / 483.2 MB, free: 39.02 MB / 382.1 MB Notification: Performance of Templates: time 0.02774/0.5126, allocations: 14.36 MB / 497.6 MB, free: 36.2 MB / 382.1 MB make -j1 -f ModelicaTest_3.2.1_ModelicaTest.Fluid.Dissipation.Verifications.PressureLoss.StraightPipe.dp_twoPhaseOverall_DP.makefile Environment - environmentSimulation: (rm -f ModelicaTest_3.2.1_ModelicaTest.Fluid.Dissipation.Verifications.PressureLoss.StraightPipe.dp_twoPhaseOverall_DP.pipe ; mkfifo ModelicaTest_3.2.1_ModelicaTest.Fluid.Dissipation.Verifications.PressureLoss.StraightPipe.dp_twoPhaseOverall_DP.pipe ; head -c 1048576 < ModelicaTest_3.2.1_ModelicaTest.Fluid.Dissipation.Verifications.PressureLoss.StraightPipe.dp_twoPhaseOverall_DP.pipe >> ../files/ModelicaTest_3.2.1_ModelicaTest.Fluid.Dissipation.Verifications.PressureLoss.StraightPipe.dp_twoPhaseOverall_DP.sim & ./ModelicaTest_3.2.1_ModelicaTest.Fluid.Dissipation.Verifications.PressureLoss.StraightPipe.dp_twoPhaseOverall_DP -abortSlowSimulation -alarm=480 -lv LOG_STATS > ModelicaTest_3.2.1_ModelicaTest.Fluid.Dissipation.Verifications.PressureLoss.StraightPipe.dp_twoPhaseOverall_DP.pipe 2>&1) Environment - environmentSimulation: