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        From the Contacts section of the action bar, click Porous Baffle  .Optional:  
  Enter a descriptive 
	 Name. 
   
 
   Select the 
	 Upstream surface and 
	 Downstream surface that represent the two sides of
	 the interface. 
   
   
	  
  From the 
	 Contact search parameters, specify the
	 distance-based tolerance for contact by selecting one of the following choices
	 from the 
	 Tolerance Type options:
   
  | Option | Description | 
|---|
 | Absolute | Specify tolerance as an absolute distance, then enter the
		  distance in the 
		  Normal Tolerance field. | 
|---|
 | Relative | Specify tolerance relative to the typical 
		  mesh
		  element size, then enter the relative size as a decimal in the 
		  Normal Tolerance field. | 
|---|
 
  From the 
	 Contact search parameters, specify the default 
	 Angle Tolerance for contact. 
   
Specify the pressure drop behavior in terms of Viscous Resistance and the Inertial Resistance across the baffle.
        Specify the temperature drop behavior across the baffle in terms of the Porosity of the baffle and Thermal Resistance across it. You can express porosity as a value 0–1; lower numbers indicate denser baffles with fewer pores.
        Click OK.
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