Using an Eddy Current Solution as the Initial Condition for a Transient Solution

In order to speed up the process of either a 2D or 3D transient solution reaching a steady state, you can set the solution from a 2D or 3D eddy current solver as the initial condition for the corresponding transient solver.

Note: Because the eddy current solution corresponds to a stationary operating condition (zero speed), in order to generate the initial condition for the transient solution with non-zero speed, a transformation of conductivity on the moving objects where eddy current is taken into account is required in the eddy current simulation. The transformation is

where σ0 is the transformed conductivity from speed n to speed zero, which is to be set in the eddy current simulation, σ is the real conductivity in transient simulation, and sn is the slip, defined as:

where ns is the synchronous speed.

If there is an end connection, the end resistance R used in the transient simulation also has to be referred to the value R0 associated with zero speed before being used in the eddy current solution by:

Prerequisites

To setup and use a 2D (or 3D) eddy current solution as the initial condition for a corresponding 2D (or 3D) transient solution:

  1. Create an eddy current source design, and ensure that Solve Matrix: After last pass is selected on the General tab of the eddy current Solve Setup dialog.
  2. Solve the eddy current design.
  3. Create a transient target design, whose geometry, boundary conditions, excitations, windings, etc., are identical to the the source eddy current design.
  4. On the transient target design's Solve Setup dialog box, Advanced tab, click Start/Continue from a previously solved setup to open the Setup Link dialog.

  5. On the Setup Link dialog General tab, select the source eddy current design and solution (Last Adaptive solution only). Refer to Setup Link for Transient Solutions for details on setting up this link.

  6. Solve the target transient design.

Note:  
  • If the source and target designs are not identical, an error message displays.
  • If the eddy current source design has not been solved, an error message displays.
  • If a legacy eddy current design solved with a previous release of Maxwell is used as the source design, you must re-solve the eddy current design before solving the target transient design or an error message will be displayed.

Related Topics 

Start/Continue from a Previously Solved Setup

Setup Link for Transient Solutions