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Old   January 27, 2011, 04:16
Default ANSYS and CFX not talking in two-way FSI?
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Donald Brashear
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I get the following error when I try to update my CFX-Pre:

In Analysis 'Flow Analysis 1' - Analysis Type: The specified Mechanical Input File 'ds.dat' can not be found or does not contain any valid interfaces. Specify an input file with valid interfaces, update the file location if it has moved or set the External Solver Coupling option to "ANSYS MultiField via Prep7".

I started the FSI analysis by starting an ANSYS transient analysis, which I confirmed to be solvable by itself. Then I deleted the results then to "Transfer Data to New -> Fluid Flow (CFX)" from the setup. I defined my fluid-structure interface loads in ANSYS.

I tried pointing manually to the 'ds.dat' file under dir\dp0\SYS\MECH\ds.dat, but the same error results.

Any thoughts? Thanks
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Old   January 31, 2011, 12:17
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In the Project Schematic delete the link between the ANSYS Setup cell and the CFX Setup cell, then re-create it and refresh CFX-Pre. That usually fixes this problem for me.
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Old   May 5, 2012, 07:32
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Ivailo Rusev
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I have the same problem as brashear. I tried to delete and re-create the link between setup cells of ANSYS and CFX, but the error still exists Do you have any other suggestions? Thanks in advance

Last edited by et1ap2; May 5, 2012 at 08:09.
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Old   May 5, 2012, 10:49
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i had this problem too.but i saved it in this manner and closed workbench after that i open it again and it works right.
sometimes you should specify the file path yourself for the software

hope to help you
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Old   May 5, 2012, 22:17
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Gwenael H.
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As Stumpy said it should work (always does for me).

If not I think you should try, >Project Directory\dp0\CFX\CFX, and use the ./ds in CFX so you have no issues when changing the project directory path.
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Old   June 13, 2012, 05:15
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Wei Zhao
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Actually it is the missing of FSIN_No# in defining the boundary of Interface of fluid and solid in CFX-re, which cause the ds.dat cannot been found or others.
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Old   November 25, 2012, 09:13
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I met the same problem. I copied the ds.dat into the target folder from an old project and it works. I checked the contents of the file(ds.dat )and it was updated according to new project.
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