id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc
2847	OM recognizes an algebraic loop where there is none.	e1026754@…	somebody	"During initiallization OM (R22462) reports an algebraic loop where there is actually none. 
In the section of the code, where the error is reported, parameters are passed down from the reactor object to the inner casing, the pipe and the outer casing. Also there should be no need for iteration.

This error did not occur in R22052, although the initialization crashed with another error.

{{{
simulate(MetalHydrideStorage.M, stopTime=1000, simflags="""", method=""dassl"")
record SimulationResult
    resultFile = """",
    simulationOptions = ""startTime = 0.0, stopTime = 1000.0, numberOfIntervals = 500, tolerance = 1e-006, method = 'dassl', fileNamePrefix = 'MetalHydrideStorage.M', options = '', outputFormat = 'mat', variableFilter = '.*', cflags = '', simflags = ''"",
    messages = ""Simulation execution failed for model: MetalHydrideStorage.M
"",
    timeFrontend = 47.74968853897553,
    timeBackend = 38.34561539851902,
    timeSimCode = 3.609517678727312,
    timeTemplates = 6.031960890188393,
    timeCompile = 21.9803886463405
end SimulationResult;
Notification: It was not possible to analyze the given system symbolically, because the relevant equations are part of an algebraic loop. This is not supported yet.
Warning: Assuming redundant initial conditions for the following 12 initial equations:
         reactor.outerCasing.s = reactor.s_oCasing
         reactor.pipe.crossArea = 3.141592653589793 * ((0.035 - reactor.s_oCasing) ^ 2.0 - (0.02755 + reactor.s_iCasing) ^ 2.0)
         reactor.pipe.crossAreas[1] = reactor.pipe.crossArea
         reactor.pipe.crossAreas[2] = reactor.pipe.crossArea
         reactor.pipe.crossAreas[3] = reactor.pipe.crossArea
         reactor.pipe.crossAreas[4] = reactor.pipe.crossArea
         reactor.pipe.crossAreas[5] = reactor.pipe.crossArea
         reactor.outerCasing.T[4] = reactor.outerCasing.T_start
         initialState.T = T0
         reactor.innerCasing.area_h = 1.570796326794897 * (0.0007590025000000001 + (0.02755 + reactor.s_iCasing) ^ 2.0) * reactor.h_Casing
         reactor.outerCasing.area_h = 1.570796326794897 * (0.001225 + (0.035 - reactor.s_iCasing) ^ 2.0) * reactor.h_Casing
         reactor.outerCasing.T_start = reactor.Twall_start
Warning: Iteration variables with default zero start attribute in torn nonlinear equation system:
         reactor.outerCasing.s:VARIABLE()  = reactor.s_oCasing  ""Wall thickness"".MetalHydrideStorage.M, .MetalHydrideStorage.Setup.Reactor, .MetalHydrideStorage.Setup.Wall, .Modelica.SIunits.Length type: Real 
         reactor.outerCasing.area_h:VARIABLE()  = 1.570796326794897 * (0.001225 + (0.035 - reactor.s_iCasing) ^ 2.0) * reactor.h_Casing  ""Heat transfer area"".MetalHydrideStorage.M, .MetalHydrideStorage.Setup.Reactor, .MetalHydrideStorage.Setup.Wall, .Modelica.SIunits.Area type: Real 
         reactor.innerCasing.area_h:VARIABLE()  = 1.570796326794897 * (0.0007590025000000001 + (0.02755 + reactor.s_iCasing) ^ 2.0) * reactor.h_Casing  ""Heat transfer area"".MetalHydrideStorage.M, .MetalHydrideStorage.Setup.Reactor, .MetalHydrideStorage.Setup.Wall, .Modelica.SIunits.Area type: Real
Warning: Iteration variables with default zero start attribute in torn nonlinear equation system:
         reactor.pipe.crossAreas[6]:VARIABLE()  = reactor.pipe.crossArea  ""cross flow areas of flow segments"".MetalHydrideStorage.M, .MetalHydrideStorage.Setup.Reactor, .Modelica.Fluid.Pipes.DynamicPipe, .Modelica.SIunits.Area type: Real 
         reactor.pipe.dimensions[1]:VARIABLE()  = 4.0 * reactor.pipe.crossArea / reactor.pipe.perimeter  ""hydraulic diameters of flow segments"".MetalHydrideStorage.M, .MetalHydrideStorage.Setup.Reactor, .Modelica.Fluid.Pipes.DynamicPipe, .Modelica.SIunits.Length type: Real 
         reactor.pipe.dimensions[2]:VARIABLE()  = 4.0 * reactor.pipe.crossArea / reactor.pipe.perimeter  ""hydraulic diameters of flow segments"".MetalHydrideStorage.M, .MetalHydrideStorage.Setup.Reactor, .Modelica.Fluid.Pipes.DynamicPipe, .Modelica.SIunits.Length type: Real 
         reactor.pipe.dimensions[3]:VARIABLE()  = 4.0 * reactor.pipe.crossArea / reactor.pipe.perimeter  ""hydraulic diameters of flow segments"".MetalHydrideStorage.M, .MetalHydrideStorage.Setup.Reactor, .Modelica.Fluid.Pipes.DynamicPipe, .Modelica.SIunits.Length type: Real 
         reactor.pipe.dimensions[4]:VARIABLE()  = 4.0 * reactor.pipe.crossArea / reactor.pipe.perimeter  ""hydraulic diameters of flow segments"".MetalHydrideStorage.M, .MetalHydrideStorage.Setup.Reactor, .Modelica.Fluid.Pipes.DynamicPipe, .Modelica.SIunits.Length type: Real 
         reactor.pipe.dimensions[5]:VARIABLE()  = 4.0 * reactor.pipe.crossArea / reactor.pipe.perimeter  ""hydraulic diameters of flow segments"".MetalHydrideStorage.M, .MetalHydrideStorage.Setup.Reactor, .Modelica.Fluid.Pipes.DynamicPipe, .Modelica.SIunits.Length type: Real 
         reactor.pipe.dimensions[6]:VARIABLE()  = 4.0 * reactor.pipe.crossArea / reactor.pipe.perimeter  ""hydraulic diameters of flow segments"".MetalHydrideStorage.M, .MetalHydrideStorage.Setup.Reactor, .Modelica.Fluid.Pipes.DynamicPipe, .Modelica.SIunits.Length type: Real 
         reactor.pipe.crossAreas[1]:VARIABLE()  = reactor.pipe.crossArea  ""cross flow areas of flow segments"".MetalHydrideStorage.M, .MetalHydrideStorage.Setup.Reactor, .Modelica.Fluid.Pipes.DynamicPipe, .Modelica.SIunits.Area type: Real 
         reactor.pipe.crossAreas[2]:VARIABLE()  = reactor.pipe.crossArea  ""cross flow areas of flow segments"".MetalHydrideStorage.M, .MetalHydrideStorage.Setup.Reactor, .Modelica.Fluid.Pipes.DynamicPipe, .Modelica.SIunits.Area type: Real 
         reactor.pipe.crossAreas[3]:VARIABLE()  = reactor.pipe.crossArea  ""cross flow areas of flow segments"".MetalHydrideStorage.M, .MetalHydrideStorage.Setup.Reactor, .Modelica.Fluid.Pipes.DynamicPipe, .Modelica.SIunits.Area type: Real 
         reactor.pipe.crossAreas[5]:VARIABLE()  = reactor.pipe.crossArea  ""cross flow areas of flow segments"".MetalHydrideStorage.M, .MetalHydrideStorage.Setup.Reactor, .Modelica.Fluid.Pipes.DynamicPipe, .Modelica.SIunits.Area type: Real 
         reactor.pipe.crossAreas[4]:VARIABLE()  = reactor.pipe.crossArea  ""cross flow areas of flow segments"".MetalHydrideStorage.M, .MetalHydrideStorage.Setup.Reactor, .Modelica.Fluid.Pipes.DynamicPipe, .Modelica.SIunits.Area type: Real
}}}"	defect	new	high	Future	Backend	trunk		initialization