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Input Examples
A complete example for a lossless cavity
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ModelInfo: {
File: dds3.ncdf //mesh file. It is the file converted using acdtool
BoundaryCondition: { //specify boundary conditions. The numbers here are sideset in cubit
Magnetic: 1, 2 //reference surfaces 1 and 2 are symmetric planes
Electric: 3 4 //set reference surfaces 3 and 4 to be electric boundary condition
Exterior: 6 //surface group 6 (maybe many surfaces) is metal
}
SurfaceMaterial: { //for each metal (exterior) surface group, list the sigma values
ReferenceNumber: 6
Sigma: 5.8e7
}
}
FiniteElement: {
Order: 2 //set the finite element basis function order to be used.
CurvedSurfaces: on
}
EigenSolver: {
NumEigenvalues: 1 //want to compute 1 mode
FrequencyShift: 10.e9 //the eigenfrequency of the mode should be above 10GHz
}
CheckPoint: {
Action: save
Directory: eigens //eigenvectors are saved out into this directory
}
PostProcess: {
Toggle: off //postprocess switch
ModeFile: dds //The prefix of the mode filename.
}
Log: thisrun.log //If you want more printout logged into the file
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acdtool postprocess eigentomode eigens |
A complete example about a cavity with lossy materials
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ModelInfo: {
File: ./pillbox.ncdf
BoundaryCondition: {
Electric: 1,2,3,4
Exterior: 6
}
Material : {
Attribute: 1
Epsilon: 1.0
Mu: 1.0
}
Material : {
Attribute: 2
Epsilon: 1.0
Mu: 1.0
EpsilonImag: -0.2 //lossy material
}
}
FiniteElement: {
Order: 1
Curved Surfaces: off
}
PostProcess: {
Toggle: off
ModeFile: mode
SymmetryFactor: 2
}
EigenSolver: {
NumEigenvalues: 2
FrequencyShift: 5e9
}
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A complete example with periodic boundary conditions
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ModelInfo: {
File: c026ds-pbc.ncdf
BoundaryCondition: {
Magnetic: 1 2
Periodic_M: 3 //master surface
Periodic_S: 4 //slave surface, the mesh should be exactly same as those on the master surface
Exterior: 6
Theta: -150
File: c026ds-pbc.ncdf //phase
}
}
FiniteElement: {
Order: 2
CurvedSurfaces: on
ScalarPotential: 1 //use A-V formulation
}
PostProcess:
{
Toggle: on
ModeFile: mode
SymmetryFactor: 8.
}
EigenSolver: {
NumEigenvalues: 1
FrequencyShift: 10e9
}
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A complete example with waveguide loaded cavity
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ModelInfo: { File: cell1fourth.ncdf BoundaryCondition: { BoundaryConditionMagnetic: {1,2,3,4 Exterior: 6 Waveguide: 7 //for each number appeared here, it should have at least one Port container later. Absorbing and Waveguide have the same effects. Omega3P internally will figure out which BC to use. } } FiniteElement: { MagneticOrder: 1 2 1 Curved Surfaces: on } PostProcess: { Toggle: on ModeFile: test } EigenSolver: { NumEigenvalues: 1 FrequencyShift: 9.e9 } CheckPoint: { Action: save Directory: eigens } Periodic_MPort: 3{ //master surface Periodic_SReferenceNumber: 47 //slave surface, the meshthis number should bematch exactlysurface samegroups asin thosewaveguide onboundary thecondition. master surface ExteriorOrigin: 6 0.0, 0.0415, 0.0 //the origin of the 2D port in the 3D coordinate system XDirection: 1.0, 0.0, 0.0 //the x axis of the 2D port in the 3D coordinate system YDirection: 0.0, 0.0, -1.0 //the y Theta:axis -150of the 2D port in //phasethe 3D coordinate system ESolver: { Type: Analytic //analytic expression is used } Mode: { WaveguideType: Rectangular //it is a rectangular waveguide ModeType: TE 1 0 } //load the TE10 mode A: 0.028499 //dimension of the waveguide in x FiniteElement: { B: 0.0134053 //dimension of the waveguide in y Order: 2} CurvedSurfaces: on ScalarPotential: 1 //use A-V formulation} } } |
Load TEM mode in a coax waveguide
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Port: { ReferenceNumber: 2 Origin: 0.0, 0.0, 0.011 ESolver: { Type: Analytic PostProcess: Mode: { Toggle: on WaveguideType: Coax ModeType: TEM ModeFile: mode A: 0.0011 //smaller radius B: 0.0033 //larger radius } } SymmetryFactor: 8. } EigenSolver} |
Load TE11 mode in a circular waveguide
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Port: { NumEigenvalues: ReferenceNumber: 12 FrequencyShift: 10e9 } |
A complete example with waveguide loaded cavity
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ModelInfoOrigin: { File: cell1fourth.ncdf0.0, 0.0, 0.1 BoundaryCondition: { XDirection: 1.0, 0.0, Magnetic: 1,2,3,4 0.0 Exterior YDirection: 6 0.0, 1.0, Waveguide: 70.0 //for each number appeared here, it should have at least one Port container later. Absorbing and Waveguide have the same effects. Omega3P internally will figure out which BC to use. } } FiniteElement:ESolver: { Type: Analytic Mode: { Order: 1 Curved Surfaces: on } Waveguide PostProcesstype: {Circular Toggle: on ModeFile: test } EigenSolver: { NumEigenvalues: Mode type: TE 1 1 FrequencyShift: 9.e9 } CheckPoint: { Action: save Directory: eigens } PortA: {0.03 ReferenceNumber: 7 //this number} should match surface groups in waveguide boundary condition.} } |
Load two TE modes in the same rectangular waveguide
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Port: { Origin: 0.0, 0.0415, 0.0 //the origin of the 2D port in the 3D coordinate systemReference number: 9 // FPC Origin: 0.0, 0.198907, -0.4479152585 XDirection: -1.0, 0.0, 0.0 //the x axis of the 2D port in the 3D coordinate systemYDirection: 0.0, 0.0, 1.0 ESolver: YDirection: 0.0, 0.0,{ -1.0 //the y axis of the 2DType: portAnalytic in the 3D coordinate system ESolverMode: { Type: Analytic WaveguideType: Rectangular //analytic expression is used ModeType: TE Mode: {1 1 WaveguideTypeA: Rectangular0.1348935946 //it is a rectangular waveguide B: 0.024973714999999970 ModeType: TE 1 0} } } Port: { Reference number: 9 //load the TE10 modeFPC Origin: 0.0, 0.198907, -0.4479152585 XDirection: -1.0, 0.0, 0.0 AYDirection: 0.028499 0, 0.0, 1.0 ESolver: { Type: Analytic //dimension of the waveguide in x Mode: { B: 0.0134053 WaveguideType: Rectangular ModeType: TE 2 //dimension0 of the waveguide in y A: }0.1348935946 } } |
Load TEM mode in a coax waveguide
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Port: { ReferenceNumberB: 20.024973714999999970 Origin: 0.0, 0.0, 0.011} ESolver: {} } |
Make a non-planar surface absorbing boundary
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Port: { ReferenceNumber: 5 Type: Analytic //reference surface ID ModeOrigin: { 0.0, 0.0, 0.0 //not used XDirection: 1.0, 0.0, WaveguideType: Coax 0.0 //not used YDirection: 0.0, 1.0, 0.0 //not used ESolver: { ModeTypeType: TEMAnalytic Mode:{ A: 0.0011 //smaller radius Mode number: 1 B: 0.0033 Waveguide //larger radiustype: ABC } Mode }type: ABC } } } |
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LinearSolver options in EigenSolver container
- The first option is that user does not provide anything. The EigenSolver container in the input file looks like:
Code Block
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EigenSolver: { NumEigenvalues:
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1 FrequencyShift:
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10.
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e9
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Tolerance: 1.
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In this case, Omega3P will use the default option for linear solver for solving shifted linear systemse-8 }
- The second option is to use float version of the sparse direct solver.
Code Block EigenSolver: { NumEigenvalues:
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1 FrequencyShift:
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10.e9 Preconditioner: MUMPSFLOAT //use the float version. memory usage reduced into
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half. }
- The third option is to use Krylov subspace method with different preconditioner.
Code Block EigenSolver: { NumEigenvalues: 1
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FrequencyShift:
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10.e9
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Preconditioner:
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MP //this use p-version of multilevel
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The code will choose either CG (real matrices) or GMRES (complex matrices) and the p-versionpreconditioner. }
of multilevel precondtioner as the solver for shifted linear systems.
- The fourth option is to use out-of-core sparse direct solver (an experimental feature).
Code Block EigenSolver: { NumEigenvalues:
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1 FrequencyShift:
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10.e9 Memory: 1000
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Load two TE modes in the same rectangular waveguide
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//if the memory usage of the matrix factor in any process is larger than 1000MBytes,
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//switch to use out-of-core solver. }
FAQ
How to calculate Wallloss Quality Factor?
There are two ways to do so. Each way has its advantage and disadvantage.
- Inside ModelInfo.BoundaryCondition define a set of boundary surfaces as Exterior.
For each of the boundary surfaces, have a corresponding SurfaceMaterial container inside ModelInfo.
For example:Code Block ModelInfo: { File: .dds3.ncdf BoundaryCondition: { Magnetic: 1, 2, 3, 4 Exterior: 6 // sideset 6 is defined as Exterior BC. } SurfaceMaterial: { // have a separate for each number in
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Exterior
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BC ReferenceNumber: 6 //the corresponding sideset in Exterior BC Sigma: 5.8e7
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//electrical conductivity of the material }
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After that, make sure you toggle the PostProcess on.}
After you run omega3p with the input file, you will get a file called "output" under the same directory. Inside the file, it has a summary of results such as:Code Block PostProcess: { Toggle: on // this should be on for computing wallloss Q ModeFile: ./dds }Code Block
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Mode : {
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TotalEnergy
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:
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4.4270939088102e-12
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QualityFactor
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:
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6478.5096350252
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File
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./dds.l0.1.144469E+10.m0
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PowerLoss
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: 4.9139118623939e-05
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Frequency
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:
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11444685657.626
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Make a non-planar surface absorbing boundary
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Port: {
ReferenceNumber: 5 //reference surface ID
Origin: 0.0, 0.0, 0.0 //not used
XDirection: 1.0, 0.0, 0.0 //not used
YDirection: 0.0, 1.0, 0.0 //not used
ESolver: {
Type: Analytic
Mode:{
Mode number: 1
Waveguide type: ABC
Mode type: ABC
}
}
}
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LinearSolver options in EigenSolver container
- The first option is that user does not provide anything. The EigenSolver container in the input file looks like:
In this case, Omega3P will use the default option for linear solver for solving shifted linear systemsCode Block EigenSolver: { NumEigenvalues: 1 FrequencyShift: 10.e9 }
- The second option is to use float version of the sparse direct solver.
Code Block EigenSolver: { NumEigenvalues: 1 FrequencyShift: 10.e9 Preconditioner: MUMPSFLOAT //use the float version. memory usage reduced into half. }
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The number after QualityFactor is the one you are looking for. This method uses perturbation theory and has advantage that it is very simple. The computation associated with it is minimal.}- Inside ModelInfo.BoundaryCondition, define the set of surfaces as Impedance (instead of Exterior in method 1).
Set the HFormulation to be 1 (this is very important). Also, have a set of corresponding SurfaceMaterials inside ModelInfo as those in method 1. For example:Code Block ModelInfo: { File: dds3.ncdf BoundaryCondition: { HFormulation: 1 Magnetic: 1, 2, 3, 4 Impedance: 6 } SurfaceMaterial
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: {
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ReferenceNumber: 6 Sigma: 5.8e7
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After you run omega3p with the input, in the output file, you will see} }Code Block
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Mode = {
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TotalEnergy = { 6.2827077634198e-07, 0 },
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ExternalQ = 6579.1486638005, QualityFactor = inf, File = './dds.l0.R1.144619E+10I8.698837E+05.m0', PowerLoss = 0,
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Frequency
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=
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The number after ExternalQ is the wall loss Q you are looking for. During the omega3p run, it should also print out the Q information such as{ 11446188331.641, 869883.69746227 } }
Note that this method set an impedance boundary condition on those surfaces and make the eigenvalue problem complex and nonlinear. It takes more time and memory to solve the problem. But the field will be in the right phase (even close to the boundary surfaces).Code Block COMMIT MODE: 0 FREQ = (11446188331.64141,869883.6974622669) k = (239.8943683519209,0.01823141417003215) Q = 6579.148663800495
Both methods should give you converged Q results if mesh is dense enough.