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This Plot Is only Relevant For A Non-Linear Analysis

Hi, I've being using ANSYS mechanical 18.2 (direct and iterative solver) in windows 7 without any issue. Recently I upgraded to a better performing (more cores and with more RAM) workstation which ...

14.06.2021 · At each global iteration (of direct solver) or local + global iteration (of iterative solver), a simple algorithm is used to solve the equations. Here simple algorithms like Newton-Raphson, quasi-Newton, etc. are used. For the direct solvers, only the “Newton” option is available.

Jun 14, 2021 · Fig. 01 Screenshot of FEM solver options available in SimScale. As shown in Fig. 01, we can see that, for structural mechanics simulations, there are several options available in the numerics section of the SimScale cloud-based platform. Of these, Multfront, MUMPS, and LDLT are direct solvers, while PETSc and GCPC are iterative solvers.

A direct solver gives the exact solution to the system of equations that define the FE model. So for a system represented by , the exact solution is where ...

Solver changes that reduce memory usage may also increase disk usage and time to solution. Iterative solvers may provide a faster method to solve linear systems ...

Iterative solvers are suitable for computationally big problems as they can often be parallelized more efficiently using algorithms. But there ...

05.08.2021 · As you note, the direct solver, also called the SPARSE SOLVER, uses LU decomposition to solve the stiffness matrix equation. The PCG solver uses an iterative algorithm to solve the stiffness matrix equation. In a linear analysis, that is done once. In a nonlinear analysis, that is done for every dot on the N-R Convergence plot (every nonlinear ...

However the stress become 400 MPa. Is there anything that i also need to change when i use direct solver? In addition under the geometry, i ...

In contrast to the direct solver, the iterative solver starts by assuming an approximate solution for the unknowns {u}. The solution is iterated ...

Jul 12, 2012 · Solver Output. When you click on the Solution Information branch in Solution, the graphics window turns to the worksheet window and you see Solver Output. This is the jobname.out file that ANSYS Mechanical APDL creates as it solves, and it is full of useful information.

ANSYS largest memory block available 588214172 : 560.96 Mbytes ANSYS memory in use 256482560 : 244.60 Mbytes Total Time (sec) for Sparse Assembly 63.53 cpu 69.02 wall Heap space available at start of BCSSL4: nHeap= 75619667 D.P. words 576.93 Mbytes Sparse Solver Memory Usage Example 1 2 Million DOF Sparse solver job

ANSYS largest memory block available 10268444 : 9.79 Mbytes ANSYS memory in use 1323917280 : 1262.59 Mbytes End of PcgEnd ANSYS largest memory block available 588214172 : 560.96 Mbytes ANSYS memory in use 256482560 : 244.60 Mbytes Total Time (sec) for Sparse Assembly 63.53 cpu 69.02 wall

The direct solvers will use more memory than the iterative solvers, but can be more robust. Iterative solvers approach the solution gradually, ...

Sparse Solver Memory Usage Example 1 (cont.) ANSYS 6.0 memory allocation. Initial memory increased to 800 Mbytes. 800 Mbytes exceeds. Optimal I/ ...

12.07.2012 · Solver Output. When you click on the Solution Information branch in Solution, the graphics window turns to the worksheet window and you see Solver Output. This is the jobname.out file that ANSYS Mechanical APDL creates …

Aug 06, 2021 · As you note, the direct solver, also called the SPARSE SOLVER, uses LU decomposition to solve the stiffness matrix equation. The PCG solver uses an iterative algorithm to solve the stiffness matrix equation. In a linear analysis, that is done once. In a nonlinear analysis, that is done for every dot on the N-R Convergence plot (every nonlinear ...

Large models often solve in less time using the Iterative PCG solver or won't run at all with the Direct Sparse solver. The PCG solver uses less memory to run in Shared Memory than in Distributed Memory so the largest models may require unticking the Distributed box.

) The sparse solver is a frontal type solver that has been optimized for sparsely populated matrices like those found in finite element analysis. From: ANSYS ...

The ANSYS program offers a large number of iterative solvers as alternatives to the direct solvers (sparse solver). These alternatives in many cases can result ...