Error: < (less-than): invalid argument : wrong type error object: inf (less-than):="" invalid="" arg

- April 21, 2020 at 6:15 pm
  
  Sayantan Biswas
  Subscriber
  
  Hello everyone,
  
  I'm working on transient Euler-Euler two phase (air-water) per phase turbulent simulation. Drag model is used Tsuchiya via udf (udf runs fine), then constant lift force is added (Tsuchiya drag + constant lift) it runs fine. But when turbulent dispersion force is added i.e. [Tsuchiya drag+ Const lift CL=0.2 + turbulent dispersion model by Simon, CT=1 (default value) & limiting function none],
  
  [time steps 0.001 sec; internal iteration 100; all spatial discretization are 2nd order upwind & volume fraction is QUICK; solution method phase Coupled SIMPLE]
  
  All residual (absolute) are in 10^-3 order range & suddenly continuity & turbulent quantities shooting up and showing the following error
  
  "Error: < (less-than): invalid argument [1]: wrong type [not a number] Error Object: inf"
  
  What is the meaning of this error? How do I tackle this?
  
  I've tried to reduce the time steps, all spatial discretization to 1st order but the outcome is still same.
- April 22, 2020 at 5:20 am
  
  DrAmine
  Ansys Employee
  
  maybe one if the returned functions are Nan or Inf. Do you see the error without UDF?
- April 22, 2020 at 5:21 am
  
  DrAmine
  Ansys Employee
  
  what happens if not using limiting function or using Burns et al.?