Learning Forum

[S.Shrestha-4]

Hi!

I am trying to use the partial slip for rarefied flow regime for simulating a nozzle with density based solver in fluent. But whenever I select this option for the wall boundary condition, I get this error. 

Error: GENERAL-CAR-CDR: invalid argument [1]: improper list

Error Object: 0

 

I am using fluent 2024 R1 and my domain is fluid. I also need to keep the wall at a certain fixed temperature. However, if I select zero heat flux, then this does not happen. Please, can someone let me know what is the error? 

[Rob]

That's a Scheme error so generally means there's a setting missing somewhere. Depending on what you set/reset/unset/changed and in what order you may have managed to activate an option that's not got a value associated with it. Check through all of the boundary conditions to see if you can find a blank selection. Right-click on Boundary Conditions to List Modified Settings as that may highlight the issue. 

If you have corrupted the case you may need to read the mesh in and set up from scratch. 

[S.Shrestha-4]

Thanks for your reply. I did set up the case from the start with reading the mesh. Right after I enable density based solver, energy equation and viscous laminar, I go to boundary conditions and put the partial slip, then I get the error. I do not have a solid wall domain, is that the reason that I can not put the partial slip? 

And what is the meaning of vibrational electronic accommodation coefficient? This also gets enabled with thermal accommodation coefficient, although I have not enabled the two temperature model in energy equation? This is what I understood from user guide" If the Two-Temperature model is engaged, a jump boundary condition is applied to the vibrational-electronic energy as suggested by Nompelis et al [107]:" 

 

[Rob]

This is what I'm seeing. 

[S.Shrestha-4]

The wall is stationary in this case? I restarted the case by reading mesh again. I tried the moving wall anyway but did not work, as soon as I click temperature in thermal conditions, I get that error again. 

If I run my case despite the error, would the solution be accurate?

 

 

[Rob]

Moving won't alter the set up issue - it's just an example model I had loaded. 

That is a Scheme error so you may find it won't run, and as I have no idea why it triggers in this case I don't know what the result would be if it did. 

[S.Shrestha-4]

This is my setup. I reaaly could not find out what problem there is, but maybe you can see it? 
Fluent
Version: 3d, dp, dbns imp, lam (3d, double precision, density-based implicit, laminar)
Release: 24.1.0
Title: 

Models
------

   Model                        Settings   
   -------------------------------------
   Space                        3D         
   Time                         Steady     
   Viscous                      Laminar    
   Heat Transfer                Enabled    
   Solidification and Melting   Disabled   
   Radiation                    None       
   Species                      Disabled   
   Coupled Dispersed Phase      Disabled   
   NOx Pollutants               Disabled   
   SOx Pollutants               Disabled   
   Soot                         Disabled   
   Mercury Pollutants           Disabled   
   Structure                    Disabled   
   Acoustics                    Disabled   
   Eulerian Wall Film           Disabled   
   Potential/Electrochemistry   Disabled   
   Multiphase                   Disabled   

Material Properties
-------------------

   Material: air (fluid)

      Property               Units      Method     Value(s)     
      -------------------------------------------------------
      Density                kg/m^3     constant   1.225        
      Cp (Specific Heat)     J/(kg K)   constant   1006.43      
      Thermal Conductivity   W/(m K)    constant   0.0242       
      Viscosity              kg/(m s)   constant   1.7894e-05   
      Molecular Weight       kg/kmol    constant   28.966       

   Material: aluminum (solid)

      Property               Units      Method     Value(s)   
      -----------------------------------------------------
      Density                kg/m^3     constant   2719       
      Cp (Specific Heat)     J/(kg K)   constant   871        
      Thermal Conductivity   W/(m K)    constant   202.4      

Cell Zone Conditions
--------------------

   Zones

      name    id   type    
      ------------------
      fluid   11   fluid   

   Setup Conditions

      fluid

         Condition       Value   
         ---------------------
         Frame Motion?   no      
         Mesh Motion?    no      

Boundary Conditions
-------------------

   Zones

      name                  id   type              
      ------------------------------------------
      bottom_plane          14   symmetry          
      nozzle_side_wall      15   wall              
      nozzle_profile_wall   16   wall              
      plume_midplane        19   symmetry          
      nozzle_midplane       17   symmetry          
      inlet                 13   pressure-inlet    
      outlet                18   pressure-outlet   

   Setup Conditions

      bottom_plane

         Condition   Value   
         -----------------

      nozzle_side_wall

         Condition                            Value                             
         --------------------------------------------------------------------
         Thermal BC Type                      Temperature                       
         Temperature [K]                      453.15                            
         Wall Motion                          Stationary Wall                   
         Shear Boundary Condition             Partial Slip For Rarefied Gases   
         Momentum Accommodation Coefficient   0.8                               
         Thermal Accommodation Coefficient    0.85                              

      nozzle_profile_wall

         Condition                            Value                             
         --------------------------------------------------------------------
         Thermal BC Type                      Temperature                       
         Temperature [K]                      453.15                            
         Wall Motion                          Stationary Wall                   
         Shear Boundary Condition             Partial Slip For Rarefied Gases   
         Momentum Accommodation Coefficient   0.8                               
         Thermal Accommodation Coefficient    0.85                              

      plume_midplane

         Condition   Value   
         -----------------

      nozzle_midplane

         Condition   Value   
         -----------------

      inlet

         Condition                   Value    
         ----------------------------------
         Gauge Total Pressure [Pa]   200      
         Total Temperature [K]       453.15   

      outlet

         Condition             Value   
         ---------------------------
         Gauge Pressure [Pa]   20      

Solver Settings
---------------

   Equations

      Equation   Solved   
      -----------------
      Flow       yes      

   Numerics

      Numeric                         Enabled   
      ---------------------------------------
      Absolute Velocity Formulation   yes       

   Under-Relaxation Factors

      Variable   Relaxation Factor   
      ----------------------------
      Solid      1                   

   Linear Solver

      Variable   Solver Type   Termination Criterion   Residual Reduction Tolerance   
      -----------------------------------------------------------------------------
      Flow       F-Cycle       0.1                                                    

   Discretization Scheme

      Variable   Scheme                
      ------------------------------
      Flow       Second Order Upwind   

   Time Marching

      Parameter        Value      
      -------------------------
      Solver           Implicit   
      Courant Number   5          

   Solution Limits

      Quantity                         Limit   
      --------------------------------------
      Minimum Absolute Pressure [Pa]   1       
      Maximum Absolute Pressure [Pa]   5e+10   
      Minimum Static Temperature [K]   1       
      Maximum Static Temperature [K]   5000    

 

[Rob]

That looks OK. Can you check 

/define/models/two-temperature/ and ensure enable? is "no". 

The only difference in my model is there is no Thermal Accommodation Coefficient  to set. 

[S.Shrestha-4]

I currently get this. So it's not enabled. 

I select temperature and get the same error

[Rob]

That's the problem: the solver has the model as off and the GUI thinks it's on. If you can turn the model on try and see if you can & then turn it off. Otherwise read the mesh into a new Fluent session and see if that works. 

[S.Shrestha-4]

I tried it, but still shows same error, even with re-reading mesh

[Rob]

You had the problem before it failed to enable? Can you try in 24R2? 

[S.Shrestha-4]

Yes, the two-temperature model does not enable even if I try to, as it tells me I don't have license. So it error exists even before enabling. 

For 24 R2 I don't have access to it. The latest version available for me if 24R1.

[Rob]

For some reason part of the model is trying to activate. You won't have a licence as it's not available by default. The question is why your model seems to try and use it. 

[S.Shrestha-4]

I have no idea, I just start the session with density based solver and then fill in the wall boundary conditions and error just appears. 

[Rob]

There may be a bug, a check this side shows that 24R2 is working. I'm not aware of any workaround for 24R1 at present.