The user must install Microsoft .Net Framework because the GEMS package is compiled by using Microsoft Visual Studio 2005. The user can install .Net Framework through the Microsoft Update option, in which the Custom -> Software, Optional options are selected.

Check whether the time signature is convergent or not, if not, the user should run more time steps until the time signature is convergent.

If the number of sampling points is not enough in the computational domain, reducing the cell size usually is a better way to improve the accuracy. However, the cost for the small cell size is the memory and simulation time. Using the non-uniform mesh can partially reduce the burden of the memory and simulation time. If the user used the automatic mesh option to generate the mesh distribution, the user can change to use the advanced option to generate mesh to obtain a better mesh distribution.

If the inaccurate result is caused by the reflection from the absorbing boundary condition, the user can use the PML boundary condition to replace the MUR. If the user is using the PML boundary, the user can add more cells or large white space between the PML and simulated objects or increase the number of PML layers. In addition, our experience shows that a proper Kappa value in the PML formula may improve the accuracy (say, Kappa=10).

If the excitation source or output parameter measurement is too close to the domain boundary or the discontinuous structure, please leave at least five cells form both the domain boundary and discontinuous structures.

If the far field and its associated parameters are inaccurate, the user should check if the options for the downsampling in the time or frequency domain is checked, if yes, please uncheck these options.

If the project includes any curved surfaces, the user may change to the conformal option in the Solver window.

Check the project model and make sure that the infinitely long structure is truncated by the absorbing boundary condition.

Check if there exist any object order problems, which may result in a wrong problem configuration.

Check if any infinitely thin PEC is involved in the simulation, if yes, the user should make sure the object input order is correct. Infinitely thin PEC may be erased if the order is wrong.

For a complicated problem, the user can use the viw option in the Material option of the Result menu in the result visualization module to check if the conductivity distribution is correct.

Increase the cell size;

Use the non-uniform mesh;

Increase the number of processors for the parallel processing version;

Reduce the number of frequencies if any far field or frequency domain field distribution is selected;

Use either PEC or PMC boundary to reduce the simulation space.

If the user finds the solution is instable, the user can use PML boundary condition to replace the MUR boundary condition if the MUR version is used currently. If the boundary is already PML, the user shoubld try to increase the Kappa value in the PML boundary condition.

For a planar structure problem, the user can increase the simulation space in the vertical direction.

Adjust the mesh distribution or change the parallel division

If any curved PEC is involved in the problem configuration, the user can try to use the conformal type.