Aerodynamic Force Matrix

[znu navad]

I used following sequence to get Q_HH (Aerodynamic Force Matrix).

assign output4='QHH',unit=94,form=formatted,status=unknown

SOL 146

DIAG 8

COMPILE SEAERO,SOUIN=MSCSOU,LIST,NOREF

ALTER 'AMP   '

OUTPUT4 QHH//0/94

CEND

 As I ran it for 3 mode shapes, the output file contains 6 by 3 matrices. Since  Q_HH  has a Real part and a Imaginary part, are the elements showing the Re and Im parts as can be seen in the attachment?

[Steven Doyle]

I don't think I'm fully understanding the question.  The Nastran DMAP guide defines the OP4 format.

I believe that your interpretation is correct, but I'd check the guide or just use the OP4 reader.

Steve

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[znu navad]

I tried to check it in quick reference guide (qrg), but as can be seen in the attachment the output file has no entry or card (for example DMI,..) so that I can search it in qrg. Regarding your second suggestion, I do not know how to use OP4 reader. could you explain it?

Kianoosh 

On Friday, March 20, 2020 at 8:37:35 PM UTC-4, steve wrote:

I don't think I'm fully understanding the question.  The Nastran DMAP guide defines the OP4 format.

I believe that your interpretation is correct, but I'd check the guide or just use the OP4 reader.

Steve

On Fri, Mar 20, 2020 at 5:08 PM znu navad <mkiano...@gmail.com> wrote:

I used following sequence to get Q_HH (Aerodynamic Force Matrix).

assign output4='QHH',unit=94,form=formatted,status=unknown

SOL 146

DIAG 8

COMPILE SEAERO,SOUIN=MSCSOU,LIST,NOREF

ALTER 'AMP   '

OUTPUT4 QHH//0/94

CEND

 As I ran it for 3 mode shapes, the output file contains 6 by 3 matrices. Since  Q_HH  has a Real part and a Imaginary part, are the elements showing the Re and Im parts as can be seen in the attachment?

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[znu navad]

* I cannot search it in qrg

[steve]

> I cannot search it in qrg

The OP4 is not defined in the QRG.  It's defined in the DMAP guide.

There's an example file (op4/test/matrix_factory.dat) that demonstrates how to dump matrices to the OP2 and OP4.  The OP4 is a bit simpler, though the OP2 is faster, but for the QHH matrix, it's so small that it doesn't matter.

> I do not know how to use OP4 reader

I'd take a look at the OP4 documentation.  There's also tests in the op4 directory.

 

https://pynastran-git.readthedocs.io/en/latest/quick_start/op4_demo.html