Examples
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Sheldon Imaoka (CSI)
Buckling of arch (example of use of pressure load stiffness matrix). For many eigenvalue (and nonlinear) buckling problems, inclusion of the pressure load stiffness matrix (BEAM188/189, SHELL181, SURF154) significantly affects results. For nonlinear buckling problems, this may also affect convergence rate.
-Theoretical: 771.12
-SHELL93 only (1st eig 840.73)
-SHELL181 only (1st eig 771.72)
-SHELL93 & SURF154 (1st eig 771.07)
-SHELL93 & SURF154, face 4 (1st eig 840.78)Change "COMPTYPE" parameter to run above 4 cases.
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Steve Groothuis (Micron Technology, Inc.)
"I have uploaded a nice mechanical contact problem using solder and a shearing ram (original work is found in Huang, et al. ECTC paper). That paper spells out the material properties necessary to perform a rate-dependent mechanical load using ANSYS. Compare the paper's Figure 3 with the /POST26 plvar plot (excellent correlation with minimal data)."
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Timothy Berger (UCLA)
"I have included a rather long input file that I used for my Ph.D. dissertation on an SGI Origin 2000 supercomputer. I believe it is the low density mesh version but if you run into problems, go to lines 157-167 starting from /BATCH and lower the numbers as you see fit for my mesh parameters. I removed all of the constraint equations from the file below as it will slow ANSYS down considerably if they are included."
For additional notes by author, see contents of macro for more details.
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Sheldon Imaoka (ANSYS, Inc.)
Simple example of new beam-to-beam contact capability in ANSYS 10.0 using CONTA176. (Note that version 10.0 or higher must be used.)
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Kal Torak
Simple input file showing radiation between two blocks using /AUX12 radiation matrix method.
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Mark Troscinski (ANSYS, Inc.)
Example of bowshock on cylinder.
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Brad Lamirand (Cooper Turbocompressor, Inc.)
Steady state conjugate heat transfer in a pipe.
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Johann Riedler (EPCOS)
"I created an input-file that simulates the skin-effect of a two-dimensional sector of a coax. During postprocessing you can clearly see the effect of the penetrating magnetic field into the metal. One may extend this model to 3D (perhaps coarser)."
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Joe Metrisin (Florida Turbine Technologies, Inc.)
"One way I've used to create a compound fillet or spline shape during an optimization run is by use of an elliptical coordinate system. You can get a very well behaved ellipse suitable for optimization with only 3-4 parameters. The procedure is to create two keypoints, and a local cylindrical coordinate system with the par1 option. Then, a line created between these two keypoints will have an elliptical shape."
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Sheldon Imaoka (CSI)
Shows rigid-flexible contact w/ shell offset.
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Sheldon Imaoka (ANSYS, Inc.)
Simple 2D example comparing SY (y-component of stress) at contact surface with CONTPRES (contact pressure). With surface-projection-based contact, results match very well, showing benefits of using surface-project-based contact (KEYOPT(4)=3 for 17x contact elements).
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Dave Lindeman (3M)
"Listed below are an ANSYS input file, and a UITFIN subroutine that demonstrate the implementation of a PID control system using a simple spring-mass system."
UITFIN.F subroutine
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Sheldon Imaoka (CSI)
Simple natural convection problem of heated fins, 2D tri.
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Steve Groothuis (Micron Technology, Inc.)
Example of using MP data to apply temp-dependent film coefficient. Please note that this macro does not have geometry and will not run by itself. It is meant to serve as an example in applying film coefficients.
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Sheldon Imaoka (CSI)
Example of couette flow, viscous heating option for incompressible flow at Flotran 5.6.p
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Sheldon Imaoka (ANSYS, Inc.)
Simple example demonstrating a sequential structural-thermoelectric analysis with plasticity and contact. The thermoelectric side uses UPGEOM to update displacements from the structural analysis.
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Steve Groothuis (Micron Technology, Inc.)
"Try this sample input file demonstrating VE cure simulation. The data originated from a Ph.D. dissertation ("Viscoelastic stress analysis and fatigue life prediction of a flip-chip-on-board electronic package.", PAUL B. KOENEMAN, Thesis (Ph.D.). University of Texas at Austin, Austin, TX 78712, USA, 1999. 113pp.)."
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Christian Semler (Mechanical Dynamics Ltd.)
"Here is an input file which computes principal stresses for a particular sector from a cyclic symmetry analysis, on all corner nodes, without using the /CYCEXPAND command. This enables the use of the *VGET command, so further manipulations are possible."
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Sheldon Imaoka (CSI)
Simple example of natural convection of horizontal cylinder.
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Keith DiRienz (FEA Technologies)
Sample input file to demonstrate the use of the undocumented DADD command.
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Steve Groothuis (Micron Technology, Inc.)
"As a starting point, if you can accept the following analogy between thermal and moisture diffusion, I think you will be pleased in solving the time-dependent diffusion using this technique. As far as the temperature-dependent moisture diffusion, alternating between moisture mechanics and thermal mechanics can probably be done by updating material properties."
(Csat is saturated moisture concentration and D is diffusion coefficient.)
"We use this analogy to simulate moisture absorption in multi-material semiconductor packages under various temperature and RH conditions. It works quite well. Ee Hua Wong (Institute of Microelectronics, Singapore) has developed the technique using ANSYS/Thermal simulations. Mr. Wong has produced several papers outlining the technique."
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Sheldon Imaoka (ANSYS, Inc.)
Attached is a simple, made-up example demonstrating use of ELBOW290 elbow element. There are 3 layers defining the pipe (plasticity and hyperelasticity). The pipe is rotated until local buckling occurs.
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(ANSYS, Inc.)
Example of use of fan model and forced convection.
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Brad Lamirand (Cooper Turbocompressor)
Here is a quick example of sequential fluid [Flotran] to thermal coupled field analysis.
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Sheldon Imaoka (ANSYS, Inc.)
A very simple example showing how to generate FLUID116 and connect it to a thermal solid (SOLID70 in this case) via SURF152 using the AFSURF command.
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Sheldon Imaoka (CSI)
Example showing 'fluid pressure' contact, beta at 5.6.
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Sheldon Imaoka (CSI)
Simple forced convection problem of heated fins, 2D tri. Just modified CONV_FINS example.
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Sheldon Imaoka (ANSYS, Inc.)
A very simple example comparing use of SURF154 elastic foundation stiffness (EFS real constant) with force-distributed constraints (using MPC-based 17x contact elements) tied to a COMBIN14 spring element.
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Brent Bristol (SpeedFam-IPEC)
From the author: "The following macro demonstrates a method for obtaining friction forces directly from a contact interface [and restart capability]."
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Sheldon Imaoka (ANSYS, Inc.)
Very simple example showing how to use element birth & death to include a non-uniform initial gap. Usually, initial gap for gasket material (TB,GASKET,,,,PARA) is assumed to be a uniform input. By using element birth and death while perturbing the nodes, one can include a non-uniform initial gap.