# Job failed with second order elements **URL:** \ **Category:** General Questions\ **Created:** [April 26, 2024, 6:46am UTC](https://prepomax.discourse.group/t/job-failed-with-second-order-elements/1700 "2024-04-26T06:46:08Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![earlybird](https://avatars.discourse-cdn.com/v4/letter/e/3ab097/32.png) [@earlybird](https://prepomax.discourse.group/u/earlybird)\ **Post date:** [April 26, 2024, 6:46am UTC](https://prepomax.discourse.group/t/job-failed-with-second-order-elements/1700/1 "2024-04-26T06:46:08Z")
Hey Everyone, i’m facing a problem with solving a static analasys when the geometry was meshed with second order elements. I was using the basic meshing option of pre pro max. When solving the job with linear elements, everything works fine. Maybe i’m doing smth. wrong in meshing. Thanks in advance Eric ---
**Author:** ![FEAnalyst](https://yyz2.discourse-cdn.com/free1/user_avatar/prepomax.discourse.group/feanalyst/32/688_2.png) [@FEAnalyst](https://prepomax.discourse.group/u/FEAnalyst)\ **Post date:** [April 26, 2024, 7:00am UTC](https://prepomax.discourse.group/t/job-failed-with-second-order-elements/1700/2 "2024-04-26T07:00:04Z")
Hard to say without knowing the details. Are there any error messages ? Can you show the model setup ? ---
**Author:** ![earlybird](https://avatars.discourse-cdn.com/v4/letter/e/3ab097/32.png) [@earlybird](https://prepomax.discourse.group/u/earlybird)\ **Post date:** [April 26, 2024, 7:54am UTC](https://prepomax.discourse.group/t/job-failed-with-second-order-elements/1700/3 "2024-04-26T07:54:58Z")
Shure, so i have an centrifugal impeller. To demonstrate the problem with second order elements, it is as simple as possible. ![grafik](https://global.discourse-cdn.com/free1/uploads/prepomax/original/2X/0/0c88b013de33a481c93cadf9d70ddc3110adad08.jpeg) I have meshed with the basic meshing setup. Second order elements active and set the element size to a reasenable value. Only one refinement was done at the rim of the impeller to assure enough geometry resolution. There is a fixed BC on the Hub, as shown in the sceenshot. The impeller rotates with 300 rad/s around the z axis. When i solve this model, the monitor is showing this message: * * * The numbers below are estimated upper bounds number of: nodes: 1479192 elements: 881096 one-dimensional elements: 0 two-dimensional elements: 0 integration points per element: 4 degrees of freedom per node: 3 layers per element: 1 distributed facial loads: 0 distributed volumetric loads: 1 concentrated loads: 0 single point constraints: 11748 multiple point constraints: 1 terms in all multiple point constraints: 1 tie constraints: 0 dependent nodes tied by cyclic constraints: 0 dependent nodes in pre-tension constraints: 0 sets: 4 terms in all sets: 3526342 materials: 1 constants per material and temperature: 2 temperature points per material: 3 plastic data points per material: 0 orientations: 0 amplitudes: 5 data points in all amplitudes: 5 print requests: 0 transformations: 0 property cards: 0 STEP 1 Static analysis was selected Decascading the MPC’s Determining the structure of the matrix: Using up to 12 cpu(s) for setting up the structure of the matrix. number of equations 4431702 number of nonzero lower triangular matrix elements 164843643 Using up to 12 cpu(s) for the stress calculation. Using up to 12 cpu(s) for the symmetric stiffness/mass contributions. Not reusing csc. ±------------------------------------------------+ - ``` PaStiX : Parallel Sparse matriX package + ``` ±------------------------------------------------+ Version: 6.0.1 Schedulers: sequential: Enabled thread static: Started thread dynamic: Disabled PaRSEC: Disabled StarPU: Disabled Number of MPI processes: 1 Number of threads per process: 12 Number of GPUs: 0 MPI communication support: Disabled Distribution level: 2D( 128) Blocking size (min/max): 1024 / 2048 Matrix type: General Arithmetic: Float Format: CSC N: 4431702 nnz: 334118988 Job failed - no results exist. Process elapsed time: 94.497 s * * * When i change the meshsetting to linear element order, the monitor is showing this message: The numbers below are estimated upper bounds number of: nodes: 225597 elements: 881096 one-dimensional elements: 0 two-dimensional elements: 0 integration points per element: 1 degrees of freedom per node: 3 layers per element: 1 distributed facial loads: 0 distributed volumetric loads: 1 concentrated loads: 0 single point constraints: 3312 multiple point constraints: 1 terms in all multiple point constraints: 1 tie constraints: 0 dependent nodes tied by cyclic constraints: 0 dependent nodes in pre-tension constraints: 0 sets: 4 terms in all sets: 3524936 materials: 1 constants per material and temperature: 2 temperature points per material: 3 plastic data points per material: 0 orientations: 0 amplitudes: 5 data points in all amplitudes: 5 print requests: 0 transformations: 0 property cards: 0 STEP 1 Static analysis was selected Decascading the MPC’s Determining the structure of the matrix: Using up to 12 cpu(s) for setting up the structure of the matrix. number of equations 675135 number of nonzero lower triangular matrix elements 11920437 Using up to 12 cpu(s) for the stress calculation. Using up to 12 cpu(s) for the symmetric stiffness/mass contributions. Not reusing csc. ±------------------------------------------------+ - ``` PaStiX : Parallel Sparse matriX package + ``` ±------------------------------------------------+ Version: 6.0.1 Schedulers: sequential: Enabled thread static: Started thread dynamic: Disabled PaRSEC: Disabled StarPU: Disabled Number of MPI processes: 1 Number of threads per process: 12 Number of GPUs: 0 MPI communication support: Disabled Distribution level: 2D( 128) Blocking size (min/max): 1024 / 2048 Matrix type: General Arithmetic: Float Format: CSC N: 675135 nnz: 24516009 ±------------------------------------------------+ Ordering step : Ordering method is: Scotch Time to compute ordering: 0.6300 ±------------------------------------------------+ Symbolic factorization step: Symbol factorization using: Fax Direct Number of nonzeroes in L structure: 218993472 Fill-in of L: 8.932672 Time to compute symbol matrix: 0.1129 ±------------------------------------------------+ Reordering step: Split level: 0 Stoping criteria: -1 Time for reordering: 0.2282 ±------------------------------------------------+ Analyse step: Number of non-zeroes in blocked L: 437986944 Fill-in: 17.865344 Number of operations in full-rank LU : 498.27 GFlops Prediction: Model: AMD 6180 MKL Time to factorize: 18.8646 Time for analyze: 0.0414 ±------------------------------------------------+ Factorization step: Factorization used: LU Time to initialize internal csc: 2.7794 Time to initialize coeftab: 0.1206 Time to factorize: 11.1591 (44.65 GFlop/s) Number of operations: 498.27 GFlops Number of static pivots: 0 Time to solve: 0.0927 - iteration 1 : total iteration time 0.0986 error 1.8785e-07 - iteration 2 : total iteration time 0.101 error 3.0834e-11 - iteration 3 : total iteration time 0.108 error 1.0337e-14 Time for refinement: 0.3722 - iteration 1 : total iteration time 0.102 error 7.5287e-17 Time for refinement: 0.1628 * * * ## CSC Conversion Time: 0.057964 Init Time: 1.105466 Factorize Time: 14.060342 Solve Time: 0.655722 Clean up Time: 0.000000 Sum: 15.879494 Total PaStiX Time: 15.879494 CCX without PaStiX Time: 11.506344 Share of PaStiX Time: 0.579843 Total Time: 27.385838 Reusability: 0 : 1 * * * Using up to 12 cpu(s) for the stress calculation. Job finished * * * Total CalculiX Time: 31.601422 * * * Process elapsed time: 31.727 s ---
**Author:** ![FEAnalyst](https://yyz2.discourse-cdn.com/free1/user_avatar/prepomax.discourse.group/feanalyst/32/688_2.png) [@FEAnalyst](https://prepomax.discourse.group/u/FEAnalyst)\ **Post date:** [April 26, 2024, 7:58am UTC](https://prepomax.discourse.group/t/job-failed-with-second-order-elements/1700/4 "2024-04-26T07:58:01Z")
> [@earlybird](#): > > nodes: 1479192 Larger meshes often cause problems in CalculiX and then it’s best to try with a different solver. Here you could use Pardiso instead of PaStiX. It can be selected in the step settings.