Michlet Input Issues

[The Scuttlebut]

Hello all,

Thanks for your help and time in advance.

I've used a program similar to Michlet in the past for my multi hull thesis, so I am familiar with how the program works, text input files, etc. The examples run fine and the results are great, however my created input files refuse to run. The output each time is "Bad Nx". I originally used FrEE!ship to create in the input files from exported VRML files from Rhino. After working through that error-prone process and looking over the resulting input file, it still doesn't work. I manually made my own using contours and intersect points in Rhino, doesn't work. I then took example files in FrEE!ship and converted them to Michlet, doesn't work.

So I guess my question is a simple one: What does "Bad Nx" mean?

[daiquiri]

How about attaching the in.mlt file, so that the others can have a look at it and try to fix it?
Cheers!

[The Scuttlebut]

Will do. I was hoping for a quick answer, but a look at my input files will do:

The Freeship 5 one is just taking a example hull and exporting it out.

The freeship_input is my hull exported to Michlet from FREE!ship.

The manual_input is my hull manually inputted by me.

Thanks.

[daiquiri]

The speed range for #Trim, #Sinkage and #Heel were wrong in your manually created input file. This is what they were looking like (#Trim example):

# Trim: speed, angle
0.0,0.0
1.0,0.0

The speed range was between 0.0 and 1.0
But your Maximum speed is 9.26 - so it was beyond the range defined for the above three variables.

This is the correct speed range:

# Trim: speed, angle
0.0,0.0
10.0,0.0

Same for #Heel and #Sinkage.

I have attached an in.mlt file, which is your manually-created one with the above corrections. It works on my PC.

Cheers!

[The Scuttlebut]

Still crashes. All I did was put it in the root Michlet directory, ran the .bat file above it, the window flashed and that was it. Out.mlt: "Error: Bad Nx" It worked for you huh? Is it a version thing?

[daiquiri]

I have checked it out again. Works fine here. Tried it on Michlet 8.07.

[The Scuttlebut]

I am using 9.20. I wonder if that is the issue. I am having trouble finding a previous version online to try that out. Any ideas of places to look?

Thanks again.

[daiquiri]

Ok, just downloaded Michlet 9.20 to give it a try and I can confirm that the above file doesn't work with this version.

I've checked out the default in.mlt file contained in Michlet 9.20 directory and have found out that it has a following new variable definition:

# Viscous Form Factor Method (0=None, 3=Dual)
3

Naturally, it was missing in the old 8.07-version of in.mlt file.
Please find attached the updated in.mlt file of your hull, containing the definition of the "# Viscous Form Factor Method" variable. It works on my Michlet 9.20

Cheers

[The Scuttlebut]

That did it. I had been looking around those parameters, figuring the error might be there and comparing the example files, must have missed it...several times. Thanks for all your help.