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POLYFLOW - Fluid escapes at contact. Why?


In a blow molding or a thermoforming simulation, it may happen that fluid escapes through a segment in contact. Such a situation is illustrated in the figures below. What is happening, and how...

POLFLOW - Meaning of the parameters for the smoothed ramp function (PMAT menu)


A new function has been introduced in the PMAT menu in POLYDATA: the smoothed ramp. This function involves four parameters, referred to as a, b, c and d. What are their respective...

GAMBIT - How to remove the distraction in the mesh around the vertex point when creating a boundary layer from a circle or ellipse


Creating a boundary layer from a simple circle or ellipse geometry causes some distractions in the mesh along the vertex point.<br>Simply go to Edit/Defaults/Mesh/Blayer and change the value...

POLYFLOW - What are the contents of a curv_* file ?


POLYFLOW produces sometimes files whose name is curv.* or curv_*.*; they are also produced when one asks for force or flux post-processor. What are the contents of such files?<br>The...

POLYFLOW - How can I set a proper value of the coefficient for the Navier's slipping law?


Let us consider the boundary of a flow domain. Let Vs denote the relative (tangential) slipping velocity of a fluid point at a solid wall of the domain. A tangential force Fs also exist, which...

Icepak - Modeling Thermostat behavior (Turn ON/OFF power based on temperature)


To turn ON/OFF the power for the source based on temperature, the following procedure can be used. This is a typical thermostat behavior where the source (power in W) needs to be turned OFF...

POLYFLOW - Tip to workaround the error: "The number of segments is not identical on each front", for free surface flow with streamwise remeshing.


A calculation involves a free surface and the streamwise remeshing technique is used. Actually the free surface sees the die on more than one boundary.<br>The calculation immediately stops,...

POLYFLOW - How to evaluate the local stretch rate (third invariant of the rate-of-deformation tensor)?


Whereas the local stretch rate is available as a variable of a user defined function , this quantity can not be selected as a post-processor of POLYDATA, and so can no be visualized via the...

FLUENT V6 - Automating the set up of certain custom settings within FLUENT


There are times when you would like to customize some settings each time a case file is read. For example there can be some custom-field functions which are used very frequently and should be...

FLUENT V6 - User-Defined Function (UDF) to flag the cells at a boundary that have reversed flow (backflow)


Can we "flag" the cells which has reverse flow (backflow)?<br>This UDF will "flag" the cells which has reverse flow, thus enables us to uniquely see which cells...

POLYFLOW - How to combine Lagrangian remeshing with fixed inflow ?


A flow case involves a free surface, possibly entering into contact with a solid wall, and involves a fixed inflow (non-deforming inflow). The appropriate remeshing technique here would be the...

FLUENT V6 - Compute solution residuals in a User-Defined Function (UDF)


Client wants to calculate solution residuals in a UDF so as to control solver settings.<br><br>The following UDF will do this.<br>#include "udf.h"<br>real...

FLUENT V6 - Custom GUI Panel to perform parametric post-processing study


Need a nice(r) gui to run parametric post-processing of sets of data files.<br>A scheme file has been written to do this.<br><br>1. Save the Resolution as...

POLYDATA - after reading/converting a GAMBIT neutral file: Microsoft error message: "polydata.exe has encountered a problem and needs to close".


When directly reading in a Gambit Neutral file in POLYDATA via the option "Read a mesh file", POLYDATA crashes and a Microsoft error message is generated: "polydata.exe has...

POLYDATA - availibility of velocity magnitude for PMAT functions or UDF


For specific appplications, one may need a slipping law that differs from the available ones. How can one define a UDF or a PMAT function on the basis of the velocity...

POLYFLOW - Validity of Cox-Merz and Gleissle empirical rules?


For some polymers, it is possible to extract non-linear viscosity data from linear measurements or from transient measurements at low shear rate. For this, we respectively apply the Cox-Merz and...

MixSim 2.0 - workaround for problem with generating hardcopy in postscript / eps format: file postscri620.hdi missing


MixSim 2.0 on Windows (only):<br>Cannot generate hardcopy in postscript / eps format.<br>Error message tells that the file postscri620.hdi could not be...

GAMBIT - "ACIS error 1015: Access violation" while importing Parasolid or IGES files on Windows platforms


Importing Parasolid or IGES geometry files into GAMBIT on the Windows platform sometimes fail with a "ACIS error 1015: Access violation" error.<br><br>Common source of...

POLYMAT - non isothermal fitting with WLF law : problem when trying to create curve at a new temperature value


The automatic fitting procedure in POLYMAT may produce a strange behaviour when the WLF equation is asked for the temperature dependence of the viscosity. For example, it may produce results that...

FLUENT V6 - User-Defined Function (UDF) to report spanwise forces acting on an aircraft wing


FLUENT can report the total force that is acting on the wing. But sometimes, it is required to know the spanwise report of forces acting on that wing. This can be achieved by using the UDF...

FLUENT - What is the meaning of the "Net" result printed from Surface Integrals command?


When using the Surface Integrals command, FLUENT prints out the quantities in the console window: for example, the area-weighted average pressure on the "inlet' and...

POLYFLOW - How to define an inverse prediction case for multiple extrudates (multi-hole profile)?


Let us consider a die with several holes, fed from one single channel that distributes the melt through the holes. Is it possible to perform an inverse extrusion simulation where the various...

POLYFLOW - how to define a moving boundary whose motion does not deform adjacent boundary sets?


Let us consider a transient flow situatoin where a border is moving, with the fluid attached at that border. How can this be modelled without generating deformations along the adjacent...

POLYFLOW - How to define a Coulomb friction law?


Coulomb friction law is such that the tangential component of the effort is proportional to the normal component. How can this be defined in POLYFLOW by using the available laws?<br>The...

FLUENT V6 - How to calcuate angular momentum flux for steady state engine port flow by using a User-Defined Function (UDF)


Engine swirl is an important parameter. However, transient swirl is not easy to measure. Steady state testing, on the other hand, is quite easy, and steady state data can be used to evaluate...