Hello everybody.

I'm running a simulation about a multiphase flow (air and dispersed water particles).

On CFX - Solver I got this error:

ERROR #001100279 has occurred in subroutine ErrAction.

Floating point exception: Overflow

Do you know which could be my mistake?

Thank you

Elisabetta

Hi,

that is a common question here. Please use the search function ! regards

I am struggling with same problem. If you find the answer please let me know how you resolved the issue.

By the i am using upwind scheme and small physical time step (for steady state) to run the case and it seems to be working for now. You could try the same. Later i intend to use this solution to run my transient case.

alpha

Hello,

try to change the turbulence model to SST. good luck

Hello again,

I was reading the 'old' post and trying the solutions you suggested me. Now I will change the turbulence model and after that i will let you know.

Thanks a lot

Elisabetta

Hi

My solution is running now and i am not getting "floating oint exception: overflow" error anymore. However, i am not being able to achieve convergence. My resilduals become flat and i do not observe any change in them for long periods. So i am facing another issue here.

alpha

Hi,

A few suggestions....I am also new though...

1) Check your boundary conditions. It should always be sensible. Try to keep outlets away from the critical zone.

2) Small time steps make sense. But in my experience small time step with steady state does not give much benefits. What I mean is - you decrease your time step, convergence is very slow and you loose the benefits of solving a steady state problem. Also, all the flows are actually unsteady but a few of them can be solved with steady state solver to get an average result. Now if your flow is no where close to steady state flow, then solver is forcing the equations to reach ONE steady state and then simulation start diverging. In such situations, try using transient simulation. They should go very well with High Resolution scheme with out any flow field as initial condition. And if your flow is really steady state, you can monitor a few points in your domain to see if steady state if obtained after some time.

Peter

Thank you peter that was helpful.

alpha

Hello

I did it at the end, thanks to all of you for your answer.

My case seems working better switching the turbulence model to SST and reducing the timestep.

See you again

Bye

Elisabetta

Hi Elisabetta : my name is shehab. I'm a PhD student in UK and I'm using the multiphase flow to simulate solid particles in water flow. I'm new here in CFX and it seems like I have the same problem you have faced here. How could you solve this problem ?. my e-mail is : shebos@hotmail.com waiting for your reply urgently. shehab

[A_Prakash]

Confirm your domain extent units in .out file.

[oewnce932c]

hi.
running an open water propeller simulation in a real dimensions(D=8m, n=100 rev/min). At the beginning of calculation 15..17 Iteration
got the same problem:
ERROR #001100279 has occurred in subroutine ErrAction.
Message:
Floating point exception: Overflow

my solution was:
making timestep smaller from 0.01sek to 0.005sek

now it is running well.

[faraday34]

Thank you for indicating your solution to the problem, Pjotr.

[rezamo]

Originally Posted by T
;85922

Hello,

try to change the turbulence model to SST. good luck

hi T i Read your post thanks so much

[ghorrocks]

This is not a very useful thread. A much more complete answer to this question is in the FAQ: http://www.cfd-online.com/Wiki/Ansys...do_about_it.3F

[Suraj Marale]

hello Elisabetta,
I am also working on multiphase flow (air and water).
While solving i got same error just like you. how you solved that error??? Can you please help me for that??

May be i am doing some wrong procedure for multiphase. Please tell me how you solved the problem?? If you have any tutorials please give me... or please tell, what extra boundry conditions i have to apply for multiphase flow... Please reply its urgent..

Thanks in advance... :-)

[ghorrocks]

Elisabetta's post was over 7 years ago. There is not many people who hang around forums for that long. Dinosaurs like me are a rare exception.

Did you read the FAQ I linked to? It gives some detail about what the problem is and what to do about it.

[Suraj Marale]

Yep, I read the FAQ and tried with the different methods which are discussed in that.. but still i am getting the errors,.. may be i did some mistakes in boundry conditions.. something might be missing in boundry condition...
Thats why i am asking for the tutorial for air and water mixture.. so that i can check my boundry conditions...

And something you are talking about tutorials available at ansys customer website, is it same as ansys help tutorials or different???? because there are no tutorials available regarding air and water mixture in ansys help....

please find your valuable time for me and can you please check it and give me the link of tutorials which are available at ansys customer website???
.
Thanks .. waiting for reply...

[ghorrocks]

ANSYS Customer website: https://support.ansys.com/portal/sit...CustomerPortal

[Suraj Marale]

thanks for the link glenn, I will check..