Abstract CFD modelling combines transport phenomena and numerical approaches to solve physical problems. Although numerical modelling of flow scenarios is the cutting edge of flow modelling, there seems to be room for improvement. This paper proposes an approach for jet modelling in a low Mach number computational code. The methodology is based on the equivalent diameter and velocity profile calculated downstream from the jet leak orifice. The novel model DESQr (Diameter of Equivalent Simulation for Quicker Run) is combined with LES (Large Eddy Simulation) to calculate the gas jet profile due to accidental releases. The model is implemented in the framework of FDS (Fire Dynamics Simulator) and the open source code is modified to handle gas dispersion scenarios. Numerical findings for jet modelling and gas dispersion are compared with experimental data. The results are also compared with a commercial CFD tool. Good agreement is observed. Significant computational time reduction is achieved. A free open source CFD tool emerges and the results presented in this work are promising.

Relatamos o caso de um paciente do sexo mascidino, dezoito anos de idade, procedente de Xapuri no Estado do Acre (Brasil), com história de episódios repetidos de meningoencefalites (três num ano), acompanhadas no local de origem. Em nosso serviço, no Instituto de Infectologia Emílio Ribas, obsewamos um quadro de poliartralgias, alterações radiológicas e broncoscópicas pulmonares e sinais neurológicos de irritação tneníngea e de comprometimento do tronco-encefãlico (com tomografia axial de crânio e exames liquóricos normais), acompanhando-se de eosinofilia periférica e títulos sorológicos elevados para Toxocara canis (EIISA). Consubstanciada a hipótese diagnostica de toxocaríase (larva migrans visceral - IMV), procedeu-se ao tratamento com tiabendazol, ocorrendo remissão clínica e laboratorial completa. Um mês após, ocorreu novo episódio de cefaléia acompanhada por rigidez de nuca (que remitiu em três dias com dexametasona) e, a partir daí, não mais obsewamos quaisquer alterações clínicas ou laboratoriais em cerca de três anos e meio de acompanhamento ambulatorial.

We relate a case of an 18-year-old man, resident of Xapuri (State of Acre, Brazil), with a history of repeated episodes of meningoencephalitis (three in one year), each one was examined by a local doctor. In our service (Emilio Ribas Institute of Infectology) we observed a patient with polyjoint aches, radiological and broncoscopical pulmonary alterations (without clinical features), meningeal and brain stem manifestations - with normal brain computed tomography and cerebrospinal fluid. Blood eosinophils and serological Toxocara canis test (ELISA) were greatly increased. With the hipothesis of Toxocariasis (Visceral Lana Migrans) we administered Thiabendazole that brought complete clinical and laboratorial remission. Lnspite of a new episode of headache with meningeal manifestation approximately one month later (treated with dexamethasone resulting in a full remission after three days) we have not finded other manifestations in approximately three and a half years of ambulatory' care.