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Old   July 31, 2008, 13:38
Default Query in two phase flow
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I'm doing my Masters (MSc) in Automotive engineering project titled "Simulation of 3D Urea spray in diesel exhaust after treatment using CFD". I use STAR CCM+. I need some help with the following message "Field function: Liquid is not available inside subdomain1 region for smoothing...." I get this message while iteration. I'm new to STAR CCM+. I appreciate CD-ADAPCO for its innovative product in this competitive world. I've checked all the required parameters such as physics model,region conditions, solvers and stopping criteria. I designed a simple exhaust pipe (3D Boundary) with catalytic converter and an injector placed at the wall perpendicular to the axis of pipe, using STAR DESIGN. I would like to simulate the fluid flow which would interact with the spray so that i could analyse the droplet distribution at the inlet surface of catalytic converter which is a major concern

I would be grateful to anyone who could help me regarding this warning message.
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Old   August 1, 2008, 10:29
Default Re: Query in two phase flow
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Dont use Scalar option as Smooth Filled.. Use Filled or Filled+Mesh options for your field function.. i think it is the problem
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Old   August 11, 2008, 21:17
Default Re: Query in two phase flow
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I'm unable to determine the stopping criterion of what i require, say for instance, sauter mean diameter. How do i check the droplet distribution ? Do i have to create a plane section perpendicular to point of spray where droplet impingement take place ? How do i change the flow angle of spray ? How do i visualize a spray ? If i need to inject Urea + aqueous solution, then i need the chemical in this solver which im unable to find it. But i see other gases and liquids. When i checked the injector details,I've seen injection direction given in x,y,z directions. For instance, if i give 0-1,-1, then it implies 45 deg. How do we interpret this flow angle ? Is there any other way that we can determine flow angle from point of injection ? I don't get the injector position data even when i create an injection point under derived parts. Logically speaking, when we create an injection point in a body, then the co-ordinates of injection point should have updated the injector position under injectors. But it didn't happen. Why ? I need to complete my project in short span of time. I learnt basics of STAR CCM+ myself.

I appreciate anyone who could guide me in answering the above questions or send me any weblink wherein i get the required information.


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