- **STAR-CCM+**
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- - **Porous Medium**
(*https://www.cfd-online.com/Forums/star-ccm/97839-porous-medium.html*)

Porous MediumHi,
This is sam from coimbatore,India.I've read the below content.I have a doubt in this, how could i calculate the Dp/L by using CFD sofware. Let i take pipe Dia 250mm length 2m. The porous region is located at 1m(middle section) porous thickness 0.25m.In this i have to consider either Total pipe length 2m or Porous lg 0.25m for find initial Parameter of Dp/L with diff velocity V m/sec for get the excel plot(K and C2). Anyone can help me Regard, Sam ******************************* The formula is Dp/L= [(viscosity/alpha)*velocity]+ [C2*1/2*density*velocity^2] (dp/l =viscousr resistance + inertial resistance) plot dp/l vs velocity in excel. The pressure drop can be obtained from cfd.The values for velocity can be arbitrarily chosen say for ex. 0 to 20 m/s (even more if you want more points) Plot Dp/L vs velocity based on above formula and examine the curve how it looks like. If it is a straight line then use only dp/l=viscous resistance. If it is a quadratic equation use (dp/l =viscousr resistance + inertial resistance). Find K and C2 with these curves. Hope this helps . cheers Nelly |

You only have to consider the porous part of your domain, since the straight pipe before and after the porous part is not covered by the Dp/L formula.
It depends on your type of problem whether you can take Dp/l from a CFD simulation or not. Please describe your problem a little more accurately. What parameters do you have? What do you want to know? How does your porous part look like? |

Quote:
Actually i want to simulate the Pr.drop by CCM+ software itself. u r saying i've consider where the porous region is present for find Dp value am i right(need not consider the total pipe length)? u consider above pipe dimension,at middle the cotton matl is present...what will be pr drop effect by cotton matl? and how to do this in CCM+? give me ur idea ..... Adv Thanx Regards, Sam0508 |

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