CEM Workshop Lectures (11/11): CEMExpert Usage of Almond Geometry for RCS Calculation

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CEMExpert™: Simple Path to
RCS Calculation
Usage of RCS software for Almond Geometry

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©ZeusNumerixPvtLtd:ConfidentialDocument
Contents
CEMExpert™ Usage for Calculation of RCS: Zeus Numerix
 Introduction
 GUI-Overview
 Automatic Almond Mesh Generation Software (AMGS)
 EMWaveZ™ Solver
 Solver Inputs
 Solver Outputs
 Conclusions
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Introduction
 CEMExpert™ is designed and developed by Zeus Numerix Pvt Ltd. Zeus Numerix Pvt.
Ltd for Defence Laboratory Jodhpur (DLJ)
 CEMExpert™ is a tool for analyzing electromagnetic scattering from complex
configurations
 CEMExpert™=GridZ™+AMGS+EMWaveZ™+ViewZ™
 CEMExpert™ can be used for almond geometry generation and simulating the
problem in independently.
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GUI Overview
 To start with CEMExpert™ click on almondmeshgen option from your start menu or
use the Desktop icon
 Almond Mesh Generation Software(AMGS) window will open which have an direct
access link to the EMWaveZ™solver at the top left side of GUI
 EMWaveZ™ Solver can also be accessed using Pre-Processor GridZ™
 AMGS GUI is shown in the next slide
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GUI Overview
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AMGS GUI

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Almond Mesh Generation Software (AMGS)
 AMGS (Almond Mesh Generating Software) uses GridZ™ and as such, AMGS can not
be used without accessing GridZ™
 AMGS helps in specifying the required almond geometry, the cavity if any, the
distance of the outer boundary form almond, creating the volume meshes,
clustering, smoothening and specifying boundary conditions automatically
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Almond Mesh Generation Software (AMGS)
 Features of Almond produced by AMGS are:
 Almond can be with and without cavity
 Frontal Cross-sectional area is the largest in yz plane
 Almond geometry is symmetric w.r.t. x-z plane.
 Cavity can be rectangular or elliptic in shape
 Cavity is always straight and aligned in x direction.
 AMGS requires three types of input:
 Geometry Parameter : Dimension of the parameters in meter
 Cavity Parameter: Cavity Type and dimension of cavity
 Grid Parameters: PPW, Wavelength and extrusion factor
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EMWaveZ™ Solver
 EMWaveZ™ uses Finite Volume Time Domain (FVTD) methodology.
 EMWaveZ™ is a Finite Volume Time Domain (FVTD) solver requiring structured
meshes.
 EMWaveZ™ is a Maxwell’s equations solver (electromagnetics solver) of CEMExpert™
 EMWaveZ™ solver calculate the scattered field only for perfectly metallic geometries.
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EMWaveZ™ Solver
Figure: EMwaveZ Solver GUI
27-Sep-2020 CEMExpert™ Usage for Calculation of RCS: Zeus Numerix
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EMWaveZ™ Solver
 Solver requires specification of following items:
 Input File
 Scheme
 Initial Setup
 Execution Setup
 Post Processing
Note : EMWaveZ™ must not be used as a `Black Box'. Selecting inappropriate options
will result in erroneous simulations that will not resemble the physical model.
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Input File
A simulation requires any one of the following input files
 Structured Geometry File : .cgns format
Menu –> File –> Import CGNS File
 System Control File : .scf format
Menu -> File -> Read Control File
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EMWaveZ™ Solver : Input File
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Figure: File Import
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EMWaveZ™ Solver : Scheme
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Figure: Macromack Scheme
Menu -> Scheme -> MacCormack
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EMWaveZ™ Solver : Initial Setup
Initial setup requires following parameters as input:
 Wave Parameters: Frequency(MHz)/Electric Size/Wavelength(m)/Wave number
 Scaling factors
 Characteristic Length : in SI unit
 Polarization : Vertical or Horizontal
 Incident Wave Axis: X –axis
 Incident Wave Plan: XY or XZ
 Incident Wave Angle: 0-360
 Illumination Type : Continuous
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EMWaveZ™ Solver : Initial Setup
Figure: Initial Setup
Menu -> Initial Setup -> Control Parameters
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EMWaveZ™ Solver : Execution
Execution menu have three options: Exectuion Setup, Post Process and Run
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EMWaveZ™ Solver : Execution Setup
Execution setup requires following inputs:
 Number of cycles
 Convergence check (Check option)
 Convergence Criteria
 Near field distance (in meters)
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Menu -> Execution -> Execution setup
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EMWaveZ™ Solver : Post Processing
 In post processing option there are two sub-options : Post Process Labels and Radar
Cross Section
 Post Process helps to label the different surfaces of geometry.
 Radar Cross Section option shows the output RCS result after the successful
completion of process
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EMWaveZ™ Solver : Post Process Labels
 Post Process Labels option allow us to give the different labels to the various surface
of the geometry. List of labels will be given with check options
Menu -> Execution -> Post Process -> Post Process Labels
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EMWaveZ™ Solver : Radar Cross Section
Radar Cross Section gives the output RCS with following option windows:
 Bi-static RCS : Graphical representation (in different planes)
 Bi-static RCS : values (in dB and dBsm) for different angles
 Monostatic RCS Values
Note : Details will be described in later slide
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EMWaveZ™ Solver : Run Solver
 To run the simulation process go to
 Menu -> Execution -> Run
 A dropdown menu would emerge with following options:
 View Execution Setup: To view all the input parameters
 Run Solver: Start the simulation
 Stop Solver: Terminate the simulation in between
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EMWaveZ™ Solver : Run Solver
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Menu -> Execution -> Run
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EMWaveZ™ Solver : Output Results
After the successful completion of the simulation we will have following output files
 Near field Bistatic RCS files : nfrcs-_*.dat
 Far field Bistatic RCS files: rcs-_*.dat
 Projectname.out.cgns : color plot of field at scattered field and at surface for
different labels
 Surface-freqMHz-polarizaton-(angle)degree.cgns : color plots of different labels
Note : color plots in .cgns format can only be visualize using post processor ViewZ™
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EMWaveZ™ Solver : Output RCS
Solver include a post processor Radar Cross Section which can help to visualize the
Bistatic RCS results within the solver
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Conclusions
 CEMExert™ has been validated with different geometries and produces good results
with in the limits
 Pre-processor provide the feasibility of designing any structured geometry for the
calculation of RCS.
 Required output data are with in the advised format.
 Generated output data can be used in easily accessible formats.
 CEMExpert™ requires a good understanding of electromagnetism hence shouldn’t be
used as a black box
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www.zeusnumerix.com
+91 72760 31511
Abhishek Jain
abhishek@zeusnumerix.com
Thank You !

CEM Workshop Lectures (11/11): CEMExpert Usage of Almond Geometry for RCS Calculation

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