[dheelibun]

Hello everyone,
I am doing fluid structure interaction using Ansys transient structural and CFX.The solver was started running smoothly.while running it was getting crashed.Then later I restarted.Then it shows the above error(Ansys CFX exited with return code 1.).But it is also showing that no isolated fluid regions were found.

[sreemvlk]

hi,,
i am also getting a same error message...is to due to lack of proper boundary conditions or due large timesteps??
have you found the answer??

[ghorrocks]

CFX has lots of unhelpful error messages and this is a good example.

It probably means the simulation diverged. Can you post the output file? And an image of what you are modelling.

[sreemvlk]

hi glen,
thanks for your prompt reply..

Problem definition:
a flexible plate which is immersed in a fluid flow,placed horizontally and fixed at four sides(square faces in figure).

I have coupled the systems using transient structural and cfx.The domain is created by aplying "boolean" to the fluid region.

But when i try to run the solver,it says "No isolated fluid regions found"...!! Is it because of any error in the interface definitions??? How do you define your interface??? is it because of using boolean option..??
The figures of my domain are attached here..
please help..

[sreemvlk]

hi glen,
this is the outfile i obtained..
This run of the CFX-14.0 Solver started at 14:21:43 on 06 May 2014 by
user user on USER-PC (intel_xeon64.sse2_winnt) using the command:

"F:\softwares\ANSYS Inc\v140\CFX\bin\perllib\cfx5solve.pl" -batch -ccl
runInput.ccl -fullname "Fluid Flow CFX_003"

Setting up CFX Solver run ...


+--------------------------------------------------------------------+
| |
| Processing ANSYS Input File (Running CCL2MF) |
| |
+--------------------------------------------------------------------+

Created E:\M.Tech\MY Project\project files\miller exp
2_pending_tasks\dp0_CFX_Solution_1\Fluid Flow CFX_003.ansys\ANSYS.mf

+--------------------------------------------------------------------+
| |
| Starting ANSYS Solver |
| |
+--------------------------------------------------------------------+


+--------------------------------------------------------------------+
| |
| CFX Command Language for Run |
| |
+--------------------------------------------------------------------+

LIBRARY:
MATERIAL: Water
Material Description = Water (liquid)
Material Group = Water Data, Constant Property Liquids
Option = Pure Substance
Thermodynamic State = Liquid
PROPERTIES:
Option = General Material
EQUATION OF STATE:
Density = 997.0 [kg m^-3]
Molar Mass = 18.02 [kg kmol^-1]
Option = Value
END
SPECIFIC HEAT CAPACITY:
Option = Value
Specific Heat Capacity = 4181.7 [J kg^-1 K^-1]
Specific Heat Type = Constant Pressure
END
REFERENCE STATE:
Option = Specified Point
Reference Pressure = 1 [atm]
Reference Specific Enthalpy = 0.0 [J/kg]
Reference Specific Entropy = 0.0 [J/kg/K]
Reference Temperature = 25 [C]
END
DYNAMIC VISCOSITY:
Dynamic Viscosity = 8.899E-4 [kg m^-1 s^-1]
Option = Value
END
THERMAL CONDUCTIVITY:
Option = Value
Thermal Conductivity = 0.6069 [W m^-1 K^-1]
END
ABSORPTION COEFFICIENT:
Absorption Coefficient = 1.0 [m^-1]
Option = Value
END
SCATTERING COEFFICIENT:
Option = Value
Scattering Coefficient = 0.0 [m^-1]
END
REFRACTIVE INDEX:
Option = Value
Refractive Index = 1.0 [m m^-1]
END
THERMAL EXPANSIVITY:
Option = Value
Thermal Expansivity = 2.57E-04 [K^-1]
END
END
END
END
FLOW: Flow Analysis 1
SOLUTION UNITS:
Angle Units = [rad]
Length Units = [m]
Mass Units = [kg]
Solid Angle Units = [sr]
Temperature Units = [K]
Time Units = [s]
END
ANALYSIS TYPE:
Option = Transient
EXTERNAL SOLVER COUPLING:
ANSYS Input File = data_transfer_only_ds.dat
Option = ANSYS MultiField
COUPLING TIME CONTROL:
COUPLING INITIAL TIME:
Option = Automatic
END
COUPLING TIME DURATION:
Option = Total Time
Total Time = 5 [s]
END
COUPLING TIME STEPS:
Option = Timesteps
Timesteps = 0.1 [s]
END
END
END
INITIAL TIME:
Option = Coupling Initial Time
END
TIME DURATION:
Option = Coupling Time Duration
END
TIME STEPS:
Option = Coupling Timesteps
END
END
DOMAIN: Default Domain
Coord Frame = Coord 0
Domain Type = Fluid
Location = B129
BOUNDARY: Default Domain Default
Boundary Type = WALL
Location = \
F130.129,F131.129,F136.129,F137.129,F138.129,F140. 129,F141.129,F143.1\
29,F144.129,F145.129,F146.129,F147.129,F148.129,F1 49.129
BOUNDARY CONDITIONS:
MASS AND MOMENTUM:
Option = No Slip Wall
END
MESH MOTION:
Option = Stationary
END
END
END
BOUNDARY: inlet
Boundary Type = INLET
Location = inlet
BOUNDARY CONDITIONS:
FLOW REGIME:
Option = Subsonic
END
MASS AND MOMENTUM:
Normal Speed = 5 [m s^-1]
Option = Normal Speed
END
MESH MOTION:
Option = Stationary
END
END
END
BOUNDARY: interface
Boundary Type = WALL
Location = interface
BOUNDARY CONDITIONS:
MASS AND MOMENTUM:
Option = No Slip Wall
END
MESH MOTION:
ANSYS Interface = FSIN_1
Option = ANSYS MultiField
Receive from ANSYS = Total Mesh Displacement
Send to ANSYS = Total Force
END
END
END
BOUNDARY: outlet
Boundary Type = OUTLET
Location = outlet
BOUNDARY CONDITIONS:
FLOW REGIME:
Option = Subsonic
END
MASS AND MOMENTUM:
Option = Average Static Pressure
Pressure Profile Blend = 0.05
Relative Pressure = 0 [Pa]
END
MESH MOTION:
Option = Stationary
END
PRESSURE AVERAGING:
Option = Average Over Whole Outlet
END
END
END
BOUNDARY: sym1
Boundary Type = SYMMETRY
Location = sym1
BOUNDARY CONDITIONS:
MESH MOTION:
Option = Unspecified
END
END
END
BOUNDARY: sym2
Boundary Type = SYMMETRY
Location = sym2
BOUNDARY CONDITIONS:
MESH MOTION:
Option = Unspecified
END
END
END
DOMAIN MODELS:
BUOYANCY MODEL:
Option = Non Buoyant
END
DOMAIN MOTION:
Option = Stationary
END
MESH DEFORMATION:
Option = Regions of Motion Specified
MESH MOTION MODEL:
Option = Displacement Diffusion
MESH STIFFNESS:
Option = Increase near Small Volumes
Stiffness Model Exponent = 10
END
END
END
REFERENCE PRESSURE:
Reference Pressure = 1 [atm]
END
END
FLUID DEFINITION: Fluid 1
Material = Water
Option = Material Library
MORPHOLOGY:
Option = Continuous Fluid
END
END
FLUID MODELS:
COMBUSTION MODEL:
Option = None
END
HEAT TRANSFER MODEL:
Option = None
END
THERMAL RADIATION MODEL:
Option = None
END
TURBULENCE MODEL:
Option = Laminar
END
END
END
INITIALISATION:
Option = Automatic
INITIAL CONDITIONS:
Velocity Type = Cartesian
CARTESIAN VELOCITY COMPONENTS:
Option = Automatic with Value
U = 0 [m s^-1]
V = 0 [m s^-1]
W = 0 [m s^-1]
END
STATIC PRESSURE:
Option = Automatic with Value
Relative Pressure = 0 [Pa]
END
END
END
OUTPUT CONTROL:
RESULTS:
File Compression Level = Default
Option = Standard
END
TRANSIENT RESULTS: Transient Results 1
File Compression Level = Default
Include Mesh = No
Option = Selected Variables
Output Variables List = Pressure,Total Mesh Displacement,Velocity
OUTPUT FREQUENCY:
Option = Every Coupling Step
END
END
END
SOLVER CONTROL:
ADVECTION SCHEME:
Option = High Resolution
END
CONVERGENCE CONTROL:
Maximum Number of Coefficient Loops = 3
Minimum Number of Coefficient Loops = 1
Timescale Control = Coefficient Loops
END
CONVERGENCE CRITERIA:
Residual Target = 1.E-4
Residual Type = RMS
END
EXTERNAL SOLVER COUPLING CONTROL:
COUPLING DATA TRANSFER CONTROL:
Convergence Target = 1e-2
Under Relaxation Factor = 0.75
ANSYS VARIABLE: FZ
Convergence Target = 1
END
ANSYS VARIABLE: UZ
Convergence Target = 1
END
END
COUPLING STEP CONTROL:
Maximum Number of Coupling Iterations = 10
Minimum Number of Coupling Iterations = 1
SOLUTION SEQUENCE CONTROL:
Solve ANSYS Fields = Before CFX Fields
END
END
END
TRANSIENT SCHEME:
Option = Second Order Backward Euler
TIMESTEP INITIALISATION:
Option = Automatic
END
END
END
END
COMMAND FILE:
Version = 14.0
Results Version = 14.0
END
SIMULATION CONTROL:
EXECUTION CONTROL:
EXECUTABLE SELECTION:
Double Precision = Off
END
INTERPOLATOR STEP CONTROL:
Runtime Priority = Standard
MEMORY CONTROL:
Memory Allocation Factor = 1.0
END
END
MFX RUN CONTROL:
MFX RUN DEFINITION:
MFX Run Mode = Start ANSYS and CFX
Process ANSYS Input File = On
Restart ANSYS Run = Off
END
MFX SOLVER CONTROL:
ANSYS Installation Root = F:\softwares\ANSYS Inc\v140\ansys
END
END
PARALLEL HOST LIBRARY:
HOST DEFINITION: userpc
Remote Host Name = USER-PC
Host Architecture String = winnt-amd64
Installation Root = F:\softwares\ANSYS Inc\v%v\CFX
END
END
PARTITIONER STEP CONTROL:
Multidomain Option = Independent Partitioning
Runtime Priority = Standard
EXECUTABLE SELECTION:
Use Large Problem Partitioner = Off
END
MEMORY CONTROL:
Memory Allocation Factor = 1.0
END
PARTITIONING TYPE:
MeTiS Type = k-way
Option = MeTiS
Partition Size Rule = Automatic
END
END
RUN DEFINITION:
Run Mode = Full
Solver Input File = Fluid Flow CFX.def
END
SOLVER STEP CONTROL:
Runtime Priority = Standard
MEMORY CONTROL:
Memory Allocation Factor = 1.0
END
PARALLEL ENVIRONMENT:
Number of Processes = 1
Start Method = Serial
END
PROCESS COUPLING:
Process Name = CFX
Host Port = 49503
Host Name = USER-PC
END
END
END
END

[sreemvlk]

+--------------------------------------------------------------------+
| |
| Solver |
| |
+--------------------------------------------------------------------+




+--------------------------------------------------------------------+
| |
| ANSYS(R) CFX(R) Solver 14.0 |
| |
| Version 2011.10.10-23.01 Tue Oct 11 00:28:38 GMTDT 2011 |
| |
| Executable Attributes |
| |
| single-int32-64bit-novc8-noifort-novc6-optimised-supfort-noprof-nos|
| |
| (C) 2011 ANSYS, Inc. |
| |
| All rights reserved. Unauthorized use, distribution or duplication |
| is prohibited. This product is subject to U.S. laws governing |
| export and re-export. For full Legal Notice, see documentation. |
+--------------------------------------------------------------------+





+--------------------------------------------------------------------+
| Job Information |
+--------------------------------------------------------------------+

Run mode: serial run

Host computer: USER-PC (PID:2464)
Job started: Tue May 06 14:22:01 2014

Connecting to the following master process:
Host Name : USER-PC
Port Number : 49503
License Cap: ANSYS CFX Solver (Max 128K Nodes)
License Cap: ANSYS CFX Solver (Introductory)
License ID: USER-PC-SYSTEM-1800-007029


+--------------------------------------------------------------------+
| Memory Allocated for Run (Actual usage may be less) |
+--------------------------------------------------------------------+

Data Type Kwords Words/Node Words/Elem Kbytes Bytes/Node

Real 21218.6 606.49 114.91 82885.3 2425.96
Integer 6563.2 187.60 35.54 25637.6 750.38
Character 3647.4 104.25 19.75 3561.9 104.25
Logical 80.0 2.29 0.43 312.5 9.15
Double 608.0 17.38 3.29 4750.0 139.03

+--------------------------------------------------------------------+
| Mesh Statistics |
+--------------------------------------------------------------------+
| Domain Name | Orthog. Angle | Exp. Factor | Aspect Ratio |
+----------------------+---------------+--------------+--------------+
| | Minimum [deg] | Maximum | Maximum |
+----------------------+---------------+--------------+--------------+
| Default Domain | 7.6 ! | 21006 ! | 101 ok |
+----------------------+---------------+--------------+--------------+
| | %! %ok %OK | %! %ok %OK | %! %ok %OK |
+----------------------+---------------+--------------+--------------+
| Default Domain | 2 21 77 | 14 30 56 | 0 <1 100 |
+----------------------+---------------+--------------+--------------+

Domain Name : Default Domain

Total Number of Nodes = 34986

Total Number of Elements = 184660
Total Number of Tetrahedrons = 184660

Total Number of Faces = 14086

+--------------------------------------------------------------------+
| Initial Conditions Supplied by Fields in the Input Files |
+--------------------------------------------------------------------+

Domain Name : Default Domain
Mesh Coordinates

+--------------------------------------------------------------------+
| Average Scale Information |
+--------------------------------------------------------------------+

Domain Name : Default Domain
Global Length = 1.8106E-01
Minimum Extent = 6.0000E-02
Maximum Extent = 1.2500E+00
Density = 9.9700E+02
Dynamic Viscosity = 8.8990E-04
Velocity = 0.0000E+00

+--------------------------------------------------------------------+
| Boundary Condition Data Supplied by External Solver Coupling |
+--------------------------------------------------------------------+

ANSYS Multi-field Solver : ANSYS
CFX Boundary : interface
CFX Variable : Total Mesh Displacement
ANSYS Interface : 1
ANSYS Variable : DISP

+--------------------------------------------------------------------+
| Checking for Isolated Fluid Regions |
+--------------------------------------------------------------------+

No isolated fluid regions were found.

+--------------------------------------------------------------------+
| The Equations Solved in This Calculation |
+--------------------------------------------------------------------+

Subsystem : Mesh Displacement

X-Disp
Y-Disp
Z-Disp

Subsystem : Momentum and Mass

U-Mom
V-Mom
W-Mom
P-Mass

CFD Solver started: Tue May 06 14:22:32 2014


+--------------------------------------------------------------------+
| Convergence History |
+--------------------------------------------------------------------+

+--------------------------------------------------------------------+
| Writing transient file 0_CS.trn |
| Name : Transient Results 1 |
| Type : Selected Variables |
| Option : Every Coupling Step |
+--------------------------------------------------------------------+

+--------------------------------------------------------------------+
| ERROR #001100279 has occurred in subroutine ErrAction. |
| Message: |
| CFX encountered the error: Read. Fatal error occurred when reque- |
| sting Total Mesh Displacement for interface. |
| |
| |
| |
| |
+--------------------------------------------------------------------+

+--------------------------------------------------------------------+
| ERROR #001100279 has occurred in subroutine ErrAction. |
| Message: |
| cplg_SendCommand failed to send the command: ERROR -- CFX encount- |
| ered the error: Read. Fatal error occurred when requesting Total |
| Mesh Displacement for interface. |
| |
| |
| |
+--------------------------------------------------------------------+

+--------------------------------------------------------------------+
| Writing crash recovery file |
+--------------------------------------------------------------------+

+--------------------------------------------------------------------+
| ERROR #001100279 has occurred in subroutine ErrAction. |
| Message: |
| Stopped in routine cplg_SendCommand |
| |
| |
| |
| |
| |
+--------------------------------------------------------------------+

+--------------------------------------------------------------------+
| An error has occurred in cfx5solve: |
| |
| The ANSYS CFX solver exited with return code 1. No results file |
| has been created. |
+--------------------------------------------------------------------+

End of solution stage.

+--------------------------------------------------------------------+
| The following transient and backup files written by the ANSYS CFX |
| solver have been saved in the directory E:/M.Tech/MY |
| Project/project files/miller exp |
| 2_pending_tasks/dp0_CFX_Solution_1/Fluid Flow CFX_003: |
| |
| 0_CS.trn |
+--------------------------------------------------------------------+


+--------------------------------------------------------------------+
| An error has occurred in cfx5solve: |
| |
| ANSYS Solver terminated with return code 256 |
+--------------------------------------------------------------------+


+--------------------------------------------------------------------+
| The results from this run of the ANSYS solver have been written to |
| E:\M.Tech\MY Project\project files\miller exp |
| 2_pending_tasks\dp0_CFX_Solution_1\Fluid Flow CFX_003.ansys |
+--------------------------------------------------------------------+


+--------------------------------------------------------------------+
| Warning! |
| |
| The ANSYS CFX Solver has written a crash recovery file. This file |
| has been saved as E:/M.Tech/MY Project/project files/miller exp |
| 2_pending_tasks/dp0_CFX_Solution_1/Fluid Flow CFX_003.res.err and |
| may be an aid to diagnosing the problem or restarting the run. |
| More details should be available in the solver output section of |
| the output file. |
+--------------------------------------------------------------------+


+--------------------------------------------------------------------+
| The following user files have been saved in the directory |
| E:/M.Tech/MY Project/project files/miller exp |
| 2_pending_tasks/dp0_CFX_Solution_1/Fluid Flow CFX_003: |
| |
| mon |
+--------------------------------------------------------------------+


This run of the ANSYS CFX Solver has finished.

[ghorrocks]

The real error is "Fatal error occurred when requesting Total Mesh Displacement for interface." Sounds like a problem coupling CFX to ANSYS. Make sure the FSI run is set up correctly.

[sreemvlk]

hi glen,
thanks for your suggestion.

I think it is the problem with the interface..The interface i have chosen includes the two large horizontal faces of the plate,in the structural region and the similar faces in the cavity formed in fluid region, as interface in the cfx..
Is this definition correct???..Does more faces needed to be added for interface..??
Is it necesssary that all the faces immersed in the fluid region needs to be considered as interface..??

[ghorrocks]

Have you looked at the FSI tutorial examples? That shows you how to set up FSI cases.