Discussion Groups
New Idea
1 Kudo

True default units

Status: New Idea
by Valued Contributor marco.mueller on ‎11-26-2014 06:36 AM

As a standard user of the software, I want to set my units once and not for every new simulation setup / evaluation.


I know there exists some default unit functionality, but it affects just a few result items...

2 Kudos

There are times where someone may want to visually look at flow traces through a model and then decide that based on the data (and coloring of the traces) they'd like to get quantitative data out. To do so manual entry of XYZ points would be required to follow along a specific streamline.


It would be useful if we could select a single trace and state the number of subdivisions to then get an XY plot through the domain

1 Kudo

Topological Error

Status: New Idea
by morteza.marivani on ‎11-21-2014 07:03 AM

This error is happened during importing of a model to SIMCFD. SIMCFD just says there is topological error somewhere in model, it doen't point out to the problematic part.

I suggest to dveloper team simply report the problematic part to use when this error is occured. It helps user to fix the issue quicker.



1 Kudo

Ability to change legend font size and style

Status: New Idea
by dabs123 on ‎11-20-2014 07:40 AM

Please build in the capability of changing font size for the numbers in the legend. When we paste images into a word document, the numbers are often too small to read. This is not necessarily a resolution issue since the legend maintains proportionality with the image. Therefore, what looks good on the Sim CFD screen does not look good in a report with the image scaled to 50%.


Autodesk Sim Mech does a brilliant job with this functionality and also allows the ability of writing in additional text with the legend such as identifying scenario name and any other user specific comments.

10 Kudos

Could this flag be included in the interface rather than hidden as a flag?


It is already a huge time saver for anyone running transient analyses but not many users are aware of it.


It will only run the number of inner iterations required (based on a user prescribed percentage change between each inner iteration) rather than the same fixed that was set value for each time step.




8 Kudos

At times it might be important to know how well your mesh enhancement captures the flow boundary layer and part of the judgement is to know the Y+ value for each layer in the enhancement of each node in the mesh.


When it comes to SST model it is proving that there is a balance betwen getting a low Y+ for the first node (0.3) as well as achieve a lot of layers through Y+ values into the 20-50s for drag sensitive models.  It is fairly straight forward to determine the minimum portion, but understanding where the rest of the mesh in respect boundary layer is difficult.

3 Kudos

Dear Autodesk Sim CFD, It will be nice to be able to map results from a previous case to a new case as the initial condition. The geometry could be somewhat different between the old case and the new case. I believe that this feature is available in ANSYS Fluent/CFX and OpenFOAM. Pei-Ying

16 Kudos


Status: Under Review
by alain.benchissou on ‎05-26-2014 05:40 AM




I would like to be able to measure distances within Study environment.

Like in a CAD or Mechanical



Status: Under Review
9 Kudos

Adjust stop iteration number during solving

Status: New Idea
by Valued Contributor nhahn on ‎07-03-2014 07:48 AM

I would like to be able to adjust the number of iterations during solving so I can cause the simulation to terminate earlier or later than originally intended, but not necessarily right now.


So if I originally asked it to run 1000 iterations, but based on how I see the solution evolving now I want it to stop at 500, I would like to be able to enter that during solving.


This could be useful during automatic mesh adapatation cycles where the convergence is happening sooner or later than expected.  I may want the current cycle to terminate soon so it can go to the next mesh level.


Alternatively if I underestimated the number of iterations then I would like to be able to extend the run time without starting and stopping the simulatin - this is especially important for large files/remote solves.


Being able to adjust other termination parameters while solving would also be useful (i.e. stop time in a transient, as opposed to iteration number; adjust the intelligent solution parameters to looser or tighter criteria; etc.)



7 Kudos

Flow Vs Time plot; fot transient analysis

Status: New Idea
by mayur.harip on ‎07-22-2014 09:50 PM

After solving for Transient analysis, i need to see the effect on flow (flow vs time plot). But currently such plot is not available as a direct output unlike velocity, press, temp. Same is the case for plots available at monitoring points. So for this I need to extract flow values for every iterations / time steps from either summery file or from bulk results by creating a plane. This is very tideous procedure!


1 Kudo

Ability to save partial results

Status: New Idea
by vdbas on ‎10-24-2014 06:11 AM

For large transient analyses it would be nice to be able to save partial results data. This would reduce the large amount of output data and storage space needed. For example, in a 10 minute scenario, couId it be possible like to output only the temperature every 10 seconds and all variables every minute.

2 Kudos

User would like to be able to import work points from Inventor and define them as monitor points in Simulation CFD. This would prevent the user from having to type in coordinates for each monitor point.

11 Kudos

Set legend to plane

Status: New Idea
by dts on ‎05-22-2014 07:54 AM

I would like to have the possibility to set the legend acording to the max and the min value on a section plane:


It would make it easy to see details wich otherwise remain hidden...

set to plane.png

12 Kudos

Combustion module

Status: New Idea
by pschneider on ‎05-09-2014 12:49 PM

Create a phase change combustion module to show proper heat release and flame impingements.  Having the ability to see post combustion chemical breakdown such as NOx or CO would be great but to be able to predict temperatures around combustion equipment is the primary desire.

4 Kudos

The majority of our CFD simulations are axisymmetric. The advantages of being able to analyze in 2D versus 3D are tremendous for us. Many of our parts are long tubes (40" to 100" long) with wall thicknesses from .031" to .062" and diameters from 1" to 4". Some tubes have a .0004" silver or copper plate on the OD or ID along its entire length. The plating has a significant impact on heat flow but the plating is impractical to model. This is because the plating is so thin compared to the tube wall thickness (77 to 155 times thinner) and because the plating is so long compared to its thickness (100,000 to 250,000 times longer), meshing causes the plating and the tube to have a godzillion elements.


The ability to select an edge and define it as a "surface part" and then to specify its thickness (example: .0004" thick) like we can do in 3D would be a great asset.


Thanks, Dan

5 Kudos

Add Total Pressure to the Bulk Calculator

Status: New Idea
by Abelry on ‎07-21-2014 07:50 AM

Calculating the mass weighted total pressure is important for internal compressible problems, valves turbines and compressors.  It is the desired variable for compressor companies to run sub models to optimize the inlet and outlet transition regions before and after the compression stages.  Last week I meet with a compressor company that is happy using another CFD tool for the compressor stage design but only have 1 user.  For the inlet and outlet transitions they are don’t more design work and feel that our CFD is a better fit and cost effective to roll out to 100 design engineers to right size new products to address new market needs.  To fit into their workflow they need to know the Total Pressure at the outlet and map effectively to their current compressor CFD tool.

3 Kudos

We have multitudes of 2D axisymmetric analyses that take about 2 minutes to run but the view factor calculations (radiation on) takes about 20 minutes. In other words it takes 10 times longer to calculate the view factors than it does to run the analysis. Many times we'll create several scenarios by cloning the previous scenario. We keep the geometry the same but we'll modify material like changing aluminum to stainless steel, or changing a thermal conductivity from 20 to 60. None of these changes should trigger a re-calculation of the view factors but it does. This is unnecessary and wastes a lot of time. Can this be changed? I don't know if it happens in 3D but it does happen in 2D.


Thanks, Dan

5 Kudos

I need to complete a thermal simulation on the nose of an aircraft constructed of a carbon-fiber resin material. I have values for the in-plane and out-of-plane thermal conductivity. Considering the geometry of the cone, I can't enter the thermal conductivities oriented with a rectilinear coordinate system (as is necessary in the material editor for this type of material). The analysis is for cooling an electronics system through the aircraft skin.


With the ongoing prolifieration of composite materials, having this capability would be significantly beneficial. If Autodesk could incorporate this ability into their simulation tool, it would be a product differentiiating capability.

4 Kudos

It is not clear which fields on the edit dialogs are editable, as the table appears entirely flat aside from a couple ellipses that hint at dialogs:


     Materials Edit


However, when you click in an interactive cell its input control is then exposed. For example:


     Materials Name Selected


     Materials Material Selected


I am proposing these controls are shown by default so it is clear which fields can be edited, and in what fashion.

3 Kudos

The 3D Viewer is currently a 32bit application. This really limits its use to smaller models. 


This should be upgraded to 64bit to be inline with us only supporting 64bit platforms.

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