I am getting rather unexpected results while calculating the current conduction. The cables (marked in the picture), have different current densities in the beginning and the end. Any reasonable explanation why I can get something like that?
The shape looks like this: .step file of the case (sorry, the mesh size is simply too large) .sif file:
Code: Select all
Header
CHECK KEYWORDS Warn
Mesh DB "." "."
Include Path ""
Results Directory ""
End
Simulation
Max Output Level = 5
Coordinate System = Cartesian
Coordinate Mapping(3) = 1 2 3
Simulation Type = Steady state
Steady State Max Iterations = 1
Output Intervals = 1
Solver Input File = case.sif
Post File = case.vtu
End
Constants
Gravity(4) = 0 -1 0 9.82
Stefan Boltzmann = 5.670374419e-08
Permittivity of Vacuum = 8.85418781e-12
Permeability of Vacuum = 1.25663706e-6
Boltzmann Constant = 1.380649e-23
Unit Charge = 1.6021766e-19
End
Body 1
Name = "Body 1"
Equation = 1
Material = 3
End
Body 2
Name = "Body 2"
Equation = 1
Material = 3
End
Body 3
Name = "Body 3"
Equation = 1
Material = 3
End
Body 4
Name = "Body 4"
Equation = 1
Material = 4
End
Body 5
Name = "Body 5"
Equation = 1
Material = 2
End
Body 6
Name = "Body 6"
Equation = 1
Material = 2
End
Body 7
Name = "Body 7"
Equation = 1
Material = 2
End
Body 8
Name = "Body 8"
Equation = 1
Material = 2
End
Body 9
Name = "Body 9"
Equation = 1
Material = 1
End
Body 10
Name = "Body 10"
Equation = 1
Material = 1
End
Body 11
Name = "Body 11"
Equation = 1
Material = 1
End
Body 12
Name = "Body 12"
Equation = 1
Material = 1
End
Body 13
Name = "Body 13"
Equation = 1
Material = 1
End
Body 14
Name = "Body 14"
Equation = 1
Material = 1
End
Body 15
Name = "Body 15"
Equation = 1
Material = 1
End
Body 16
Name = "Body 16"
Equation = 1
Material = 1
End
Body 17
Name = "Body 17"
Equation = 1
Material = 1
End
Body 18
Name = "Body 18"
Equation = 1
Material = 1
End
Body 19
Name = "Body 19"
Equation = 1
Material = 1
End
Body 20
Name = "Body 20"
Equation = 1
Material = 1
End
Body 21
Name = "Body 21"
Equation = 1
Material = 1
End
Body 22
Name = "Body 22"
Equation = 1
Material = 1
End
Body 23
Name = "Body 23"
Equation = 1
Material = 1
End
Body 24
Name = "Body 24"
Equation = 1
Material = 1
End
Body 25
Name = "Body 25"
Equation = 1
Material = 1
End
Body 26
Name = "Body 26"
Equation = 1
Material = 1
End
Body 27
Name = "Body 27"
Equation = 1
Material = 1
End
Body 28
Name = "Body 28"
Equation = 1
Material = 1
End
Body 29
Name = "Body 29"
Equation = 1
Material = 1
End
Body 30
Name = "Body 30"
Equation = 1
Material = 1
End
Body 31
Name = "Body 31"
Equation = 1
Material = 1
End
Body 32
Name = "Body 32"
Equation = 1
Material = 1
End
Body 33
Name = "Body 33"
Equation = 1
Material = 1
End
Body 34
Name = "Body 34"
Equation = 1
Material = 1
End
Body 35
Name = "Body 35"
Equation = 1
Material = 1
End
Body 36
Name = "Body 36"
Equation = 1
Material = 1
End
Body 37
Name = "Body 37"
Equation = 1
Material = 1
End
Body 38
Name = "Body 38"
Equation = 1
Material = 1
End
Body 39
Name = "Body 39"
Equation = 1
Material = 1
End
Body 40
Name = "Body 40"
Equation = 1
Material = 1
End
Body 41
Name = "Body 41"
Equation = 1
Material = 1
End
Body 42
Name = "Body 42"
Equation = 1
Material = 1
End
Body 43
Name = "Body 43"
Equation = 1
Material = 1
End
Body 44
Name = "Body 44"
Equation = 1
Material = 1
End
Body 45
Name = "Body 45"
Equation = 1
Material = 1
End
Body 46
Name = "Body 46"
Equation = 1
Material = 1
End
Body 47
Name = "Body 47"
Equation = 1
Material = 1
End
Body 48
Name = "Body 48"
Equation = 1
Material = 1
End
Body 49
Name = "Body 49"
Equation = 1
Material = 1
End
Body 50
Name = "Body 50"
Equation = 1
Material = 1
End
Body 51
Name = "Body 51"
Equation = 1
Material = 1
End
Body 52
Name = "Body 52"
Equation = 1
Material = 1
End
Body 53
Name = "Body 53"
Equation = 1
Material = 1
End
Body 54
Name = "Body 54"
Equation = 1
Material = 1
End
Body 55
Name = "Body 55"
Equation = 1
Material = 1
End
Body 56
Name = "Body 56"
Equation = 1
Material = 1
End
Body 57
Name = "Body 57"
Equation = 1
Material = 1
End
Body 58
Name = "Body 58"
Equation = 1
Material = 1
End
Body 59
Name = "Body 59"
Equation = 1
Material = 1
End
Body 60
Name = "Body 60"
Equation = 1
Material = 1
End
Body 61
Name = "Body 61"
Equation = 1
Material = 1
End
Body 62
Name = "Body 62"
Equation = 1
Material = 1
End
Body 63
Name = "Body 63"
Equation = 1
Material = 1
End
Body 64
Name = "Body 64"
Equation = 1
Material = 1
End
Body 65
Name = "Body 65"
Equation = 1
Material = 1
End
Body 66
Name = "Body 66"
Equation = 1
Material = 1
End
Body 67
Name = "Body 67"
Equation = 1
Material = 1
End
Body 68
Name = "Body 68"
Equation = 1
Material = 1
End
Body 69
Name = "Body 69"
Equation = 1
Material = 1
End
Body 70
Name = "Body 70"
Equation = 1
Material = 1
End
Body 71
Name = "Body 71"
Equation = 1
Material = 3
End
Body 72
Name = "Body 72"
Equation = 1
Material = 1
End
Body 73
Name = "Body 73"
Equation = 1
Material = 2
End
Solver 1
Equation = Static Current Conduction
Procedure = "StatCurrentSolve" "StatCurrentSolver"
Variable = Potential
Calculate Volume Current = True
Exec Solver = Always
Stabilize = True
Optimize Bandwidth = True
Steady State Convergence Tolerance = 1.0e-5
Nonlinear System Convergence Tolerance = 1.0e-7
Nonlinear System Max Iterations = 200
Nonlinear System Newton After Iterations = 3
Nonlinear System Newton After Tolerance = 1.0e-3
Nonlinear System Relaxation Factor = 1
Linear System Solver = Iterative
Linear System Iterative Method = BiCGStab
Linear System Max Iterations = 1000
Linear System Convergence Tolerance = 1.0e-10
BiCGstabl polynomial degree = 4
Linear System Preconditioning = none
Linear System ILUT Tolerance = 1.0e-3
Linear System Abort Not Converged = False
Linear System Residual Output = 10
Linear System Precondition Recompute = 1
End
Equation 1
Name = "Equation 1"
Active Solvers(1) = 1
End
Material 1
Name = "Copper (generic)"
Poisson ratio = 0.34
Density = 8960.0
Youngs modulus = 115.0e9
Electric Conductivity = 59.59e6
Heat Capacity = 385.0
Heat expansion Coefficient = 16.5e-6
Sound speed = 3810.0
Heat Conductivity = 401.0
End
Material 2
Name = "Steel (stainless - generic)"
Poisson ratio = 0.285
Youngs modulus = 200.0e9
Heat Capacity = 460.0
Heat Conductivity = 24.0
Heat expansion Coefficient = 14.9e-6
Electric Conductivity = 1.824e6
Density = 7925.0
Sound speed = 5100.0
End
Material 3
Name = "Vapour"
Electric Conductivity = 2.17e-11
End
Material 4
Name = "IG"
Electric Conductivity = 5e-9
End
Boundary Condition 1
Target Boundaries(4) = 462 464 466 468
Name = "Ground"
Potential = 0
End
Boundary Condition 2
Target Boundaries(186) = 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443
Name = "120kV"
Potential = 120000
End
Ted.