Hello Karthik,

thanks for your prompt reply. we are solving in compressible flow with k epsilon model. we are enabling  species transport with ammonia mass fraction from certain source generation surfaces. these source generation surfaces are not our volumetric flow inlets. our volumetric flow inlets are defined separately with only fresh air coming into the domain. attaching an image for better understanding.


see the simulation procedure we are following in our case.


Steps for Meshing :


  1. Import Geometry unit in mm

  2. No local sizing

  3. Compute Surface mesh: Min size: 20 mm and Max Size:  200 mm

  4. Define boundary layers at the extract, inlet, surface-emitting surfaces

  5. Compute Volume Mesh size: Max size: 800 mm, number of the buffer layer 3, number of peer layer = 2





  1. Ammonia emitting surface =  mass flow inlet with total emission from one selling kiosk =  4.5 e-08 kg/s  or 5.02 e-09 kg/sm2

  2. Number of selling kiosk  =10

  3. Ammonia emitting surface = mass flow inlet from cleaning kiosk = 4.4 e08 kg/s or 1.8 e-09 kg/sm2

  4. Extract points along the entire selling kiosk (total extracat from 10 selling kiosk =  5740 l/s)

  5. Supply and extract points within the cleaning kiosk (Total supply within the cleaning kiosk =1000 l/s and total extract within cleaning = 1236 l/s)

  6. Supply and extract  points located at the column of the market (total supply from column = 9360 l/s, total extract  from column = 2344 l/s)


I hope the above data helps. 


i have one more doubt. if we try to match the inlet flow rate with extract flow rate, is it possible to use velocity inlet at both boundary conditions.