||February 26, 2010 08:37
I'm quite new to ANSYS -CFX and i don't have wide experience in CFD analysis. However, i'm exposed to fluid mechanics, heat transfer and numerical methods and i've read CFD fundamentals. I still find difficult to understand certain concepts. I'm a fresh postgraduate and i used CFD for my thesis. I'm practising CFD now. I'm currently working on an automotive exhaust component such as EGR valve to determine the temperature proven capability. I'm not sure about the boundary conditions that i use. To be precise, the valve pushes down inside the EGR assembly so that flue gases enter through the gaps and leaves out. Valve timing would be 150 ms operation. I calculated the mass flow rate of gas mixture (standard data taken) and i know the inlet pressure. Generally the total pressure is the sum of static pressure / gauge pressure and operating pressure. I also know the differential pressure across the valve (5Kpa) and inlet temperature (750 C). My aim is to calculate the temperature distribution on the solid plunger that moves up and down i.e I'm looking at temperature distribution on plunger due to fluid flow. I don't get proper convergence trends. My initial conditions are static pressure and temperature. Even i'm not sure about these values. I had guessed and put these values. How do we judge initial conditions and how do we interpret results in CFD. When i ran the simulation, the temperature distribution on valve seems to be almost equal i.e. i see slight variation. I need to convince my boss that CFD analysis helps to accelerate product development. Please help me.