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</o:shapelayout></xml><![endif]--></head><body lang=EN-GB link=blue vlink=purple><div class=WordSection1><p class=MsoNormal>I need to carry out a Pedestrian wind comfort (Lawson) Assessment using ANSYS CFX, I’m reading ‘Wind Effects on Buildings’ and the Franke et al paper etc. but it’s still not entirely clear to me. If you have any guidance that would be great, particularly:<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo1'><![if !supportLists]><span style='font-family:Symbol'><span style='mso-list:Ignore'>·<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]>How many wind directions are required? Lawson and the BRE DG520 suggest 12 but I have heard of 8 directions being used. There’s a big difference in processor/ post-processing time between the two.<o:p></o:p></p><p class=MsoNormal style='text-autospace:none'><o:p> </o:p></p><p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo1;text-autospace:none'><![if !supportLists]><span style='font-family:Symbol'><span style='mso-list:Ignore'>·<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]>How are the results from the CFD usually post-processed to produce the acceptability criteria throughout the domain? Is it a case of writing some kind of script for the postprocessor using weighting functions based on the local wind data? Are there any examples or guidance on this? <o:p></o:p></p><p class=MsoListParagraph><o:p> </o:p></p><p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo1;text-autospace:none'><![if !supportLists]><span style='font-family:Symbol'><span style='mso-list:Ignore'>·<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]>Any guidance on suitable turbulence models for CFX?<o:p></o:p></p><p class=MsoListParagraph><o:p> </o:p></p><p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo1;text-autospace:none'><![if !supportLists]><span style='font-family:Symbol'><span style='mso-list:Ignore'>·<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]>Finally what wind speed is used for the actual modelling, I assume the 10 year average speed then post processing takes account of variation in local wind speed, peak gust etc?<o:p></o:p></p><p class=MsoNormal style='text-autospace:none'><o:p> </o:p></p><p class=MsoNormal style='text-autospace:none'>Thanks,<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><b><span lang=EN-US style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D;mso-fareast-language:EN-GB'>Dr Claire Das Bhaumik CEng MCIBSE<o:p></o:p></span></b></p><p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D;mso-fareast-language:EN-GB'>Senior Environmental Modeller<o:p></o:p></span></p><p class=MsoNormal><b><span lang=EN-US style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D;mso-fareast-language:EN-GB'><o:p> </o:p></span></b></p><p class=MsoNormal><span lang=EN-US style='font-size:15.0pt;font-family:"Arial","sans-serif";color:#0761AF;mso-fareast-language:EN-GB'>HOARE LEA <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:9.0pt;font-family:"Gill Sans MT","sans-serif";color:#5E605E;letter-spacing:1.5pt;mso-fareast-language:EN-GB'>SUSTAINABILITY</span><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:gray;mso-fareast-language:EN-GB'> </span><span lang=EN-US style='font-size:9.0pt;font-family:"Arial","sans-serif";color:gray;mso-fareast-language:EN-GB'><o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:9.0pt;font-family:"Arial","sans-serif";color:gray;mso-fareast-language:EN-GB'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:9.0pt;font-family:"Arial","sans-serif";color:black;mso-fareast-language:EN-GB'>Tel +44 (0)20 3668 7100 <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:9.0pt;font-family:"Arial","sans-serif";color:black;mso-fareast-language:EN-GB'>DDI +44 (0)20 3668 7179<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:9.0pt;font-family:"Arial","sans-serif";color:black;mso-fareast-language:EN-GB'>Fax +44 (0)20 3479 1591 <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black;mso-fareast-language:EN-GB'><o:p> </o:p></span></p><p class=MsoNormal><b><span style='color:red;mso-fareast-language:EN-GB'>Hoare Lea London has moved! 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