OpenFAST Simulink compilation in dev branch crashing.

[aidowu]

I want to ask if you can give a timeline for when the Simulink OpenFAST version (at least up to the TCF MOD2 merge) in the development branch will be ready?

We tried compiling currently as is, to get started on our work, pending the time the updates gets completed. While the OpenFAST compiled for the command line works, the Simulink compilation keeps crashing MATLAB.

[andrew-platt]

How are you compiling it, which compiler, and which platform?

[aidowu]

I am compiling following the steps listed in the attached file which I found on this forum. I am compiling for windows x64. It does compile and I generate the S-Function from the compilation but when I try running it, it crashes MATLAB. I have followed the steps in the attached document to compile the main branch and that runs well.

So I want to verify if the Simulink compilation process has been validated or when it will be validated?
OpenFAST_Simulink.pdf

[andrew-platt]

Are there any errors from the create_FAST_SFunc.m script?

[aidowu]

There are no errors. Here is a picture of the directory containing the compiled files.

[andrew-platt]

What version of the Intel Fortran compiler are you using with Visual Studio? And which version of MATLAB?

Which Simulink example case are you running?

Also, I'm not entirely sure what you are asking about in terms of timeline. The TCF MODS2 branch was merged in January, but did not contain any updates for control channels. If you are asking about the cable control channels, there is a branch in development associated with this pull request: #664.

[aidowu]

I am using Intel Parallel Studio X17 and I didn't run any of the Simulink example cases but ran a project case that worked with the main dev Simulink compilation. I will go run an example case to see if I can narrow down where the issue might be.

Looking through the pull request you mentioned above, I'll modify my question by asking if the Simulink version in the development branch has been validated for the cable control updates? That way I can know if the error is from my path or if it might be a bug?

[andrew-platt]

Did you update the input file set for your project? Several input files have changed between the main branch and the development branch. There had been some error handling issues that were causing MATLAB to crash when there were input file errors -- I those had been corrected in the development branch.

The development branch does not currently contain any of the cable control functionality. We hope to merge that in by the end of the month (#664).

[aidowu]

Hi Andrew, thanks for the update on the status of the cable control capability.
Yes, I did update the input file. I found that deleting the temp file created by Simulink helped the simulation advance but I am now getting an error of "size of NumOutputs is invalid". I have attached a screenshot of this error. Can you help provide some insight on why I might be getting this error?

[andrew-platt]

Which branch are you using?

If you are using the branch in PR #664, there are some changes in the Simulink interface from the OpenFAST main and dev branches.

[aidowu]

Yes, I am using the branch PR #664. Does that mean that I need to change the open loop block I have to the open loop block in the Simulink example folder?
What I have done initially was just compile the SFunc using the branch PR #664, modify the input files (ServoDyn) and run the simulation using a previous simulink model that worked with the OpenFAST main branch.

[andrew-platt]

Yes. You will need to change your Similink model to match the setup in the examples. There are an additional 43 channels in the new block configuration in 3 groups:

• airfoil command: 3
• Cable DeltaL command: 20
• Cable DeltaLDot command: 20

[aidowu]

Thanks a lot Andrew. I'll make the modifications and see how it goes.

[andrew-platt]

Hi @aidowu,

There might be another issue going on here with the output handling within OpenFAST that is causing a mismatch between the list of output channels passed to Simulink and the size of the array holding the output channel data. The current suspicion is that one of the modules has a bug with this and is causing the FAST_Start:size of NumOutputs is invalid. error.

Can you post your outlist section for the HydroDyn input file?

[aidowu]

Hi @Andrew-P, I attached the output section of my HydroDyn input file (It's only Wave1Elev).

I am yet to get the Simulink running. It's currently just hanging and no longer getting to the point of returning the "size of NumOutputs is invalid" error after updating the model and input files.

latt ,